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Miranda Cosgrove - This little know-it-all on 'Drake & Josh' became an even bigger child star in the lead role of her own Nickelodeon show, 'iCarly.'

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Miranda Cosgrove - All grown up, the actress is most famous for lending her voice to the 'Despicable Me' franchise. She also went to the University of Southern California, where she studied both film and psychology.

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Jerry Trainor - Trainor brought his quirkiness to both 'Drake & Josh' and 'iCarly' with Miranda Cosgrove.

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Jerry Trainor - He's since voiced the title character on 'T.U.F.F. Puppy,' and voiced two characters in the animated 'Transformers: Robots In Disguise' series.

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Nathan Kress - The world first knew and loved him as Freddie Benson in 'iCarly' as well as the spin-off 'Sam & Cat.'

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Nathan Kress - He directed some Nickelodeon shows, became a husband and a father, and lent his voice to the Netflix cartoon 'Pinky Malinky.'

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Jennette McCurdy - McCurdy got her start on 'iCarly' and later starred in the spin-off 'Sam & Cat.'

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Jennette McCurdy - She reunited with 'iCarly' co-star Nathan Kress in 2017 for a short which she also co-wrote and co-directed. In 2018, she starred in the comedy 'Little B***hes,' which also featured Moises Arias from 'Hannah Montana.'

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Ariana Grande - Though you know her well now, Grande got her big break on 'Victorious,' and later starred in the spin-off 'Sam & Cat.'

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Ariana Grande - Of course, now her music career has entirely eclipsed her acting career, and she continues to break the internet.

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Victoria Justice - Starting out as Lola on 'Zoey 101,' Justice later earned a starring role on 'Victorious.'

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Victoria Justice - Since then, she notably starred in 'The Rocky Horror Picture Show: Let's Do the Time Warp Again,' and 'Naomi and Ely's No Kiss List.'

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Matt Bennett - The dorky Robbie from 'Victorious' finally split from Rex the puppet...

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Matt Bennett - And he went on to guest-star on shows like 'The Big Bang Theory,' 'Shameless,' 'Fresh Off the Boat,' and 'American Vandal.' He also appeared in Ariana Grande's 'Thank U, Next' music video.

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Elizabeth Gillies - Gillies got her first big acting debut co-starring on 'Victorious.'

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Elizabeth Gillies - Her most notable role since then is on the show 'Dynasty.'

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Avan Jogia - If viewers thought the 'Victorious' star was a high school heartthrob, wait until you see him all grown up.

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Avan Jogia - Jogia co-starred with Victoria Justice in a comedy called 'The Outcasts,' and starred in the thriller 'The Drowning' as well as the sci-fi show 'Ghost Wars.' He's currently on the series 'Now Apocalypse.'

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Emma Roberts - Remember when Roberts was the epitome of the awkward middle school phase on 'Unfabulous'?

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Emma Roberts - She's since starred in series like 'American Horror Story' and 'Scream Queens,' as well as films like 'We're the Millers,' 'Nerve,' and 'Billionaire Boys Club.'

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Jordan Calloway - Calloway co-starred with Emma Roberts on 'Unfabulous.'

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Jordan Calloway - Now he's best known for his role as Chuck Clayton on 'Riverdale,' as well as for his good looks. 

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Kel Mitchell - Mitchell starred in the hit shows 'All That' and 'Kenan & Kel.'

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Kel Mitchell - He's been on 'Game Shakers' and 'Dancing with the Stars,' and established himself as a stand-up comedian, musician, singer, and rapper.

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Kenan Thompson - Thompson first started making people laugh on 'All That' and 'Kenan & Kel.'

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Kenan Thompson - Now he's best known for his hilarious work on 'Saturday Night Live.'

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Drake Bell - From 'All That,' to 'The Amanda Show,' to 'Drake & Josh,' Bell was Nickelodeon royalty.

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Drake Bell - He voiced the animated Spider-Man, and established a music career for himself as well. 

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Josh Peck - This adorable face accompanied Bell the whole way, from 'All That,' to 'The Amanda Show,' and then to 'Drake & Josh.'

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Josh Peck - The transformation is inspiring! He's shared YouTube vlogs, a podcast, and he's been acting in films like 'Take the 10' and 'Locating Silver Lake.'

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Keke Palmer - Palmer's Nickelodeon claim to fame was the lead role in 'True Jackson, VP.'

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Keke Palmer - Destined for greatness, Palmer became the first African-American actress to portray Cinderella on Broadway. She also starred in 'Scream Queens,' established a music career, wrote a book, launched her own label, and appears in 2019's 'Hustlers.'

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Ashley Argota - Argota played Lulu in 'True Jackson, VP.'

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Ashley Argota - She's now recognized as Lou, an edgy musician on 'The Fosters.' She's continued to work on other shows and co-starred with fellow Nickelodeon alum Drake Bell in the film 'Cover Versions.'

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Jamie Lynn Spears - After 'All That,' Spears got her own show, 'Zoey 101.' When she announced she was pregnant at age 16, however, she sent her career into hiatus.

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Jamie Lynn Spears - In 2013, however, she launched a country music career for herself, and in 2019 she was cast as a series regular in the upcoming romance drama series 'Sweet Magnolias.'

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Paul Butcher - This tiny guy played Zoey's trouble-making little brother Dustin on 'Zoey 101.'

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Paul Butcher - He's since revealed himself to be quite the singer, releasing his first original song, 'Ain't Hurtin' Nobody,' in 2017.

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Erin Sanders - The young actress played the science-loving oddball Quinn Pensky in 'Zoey 101.'

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Erin Sanders - She's since appeared on shows like 'Mad Men' and 'Melissa & Joey,' as well as the movie 'Limelight.'

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Sean Flynn - Who could forget the endearing Chase Matthews on 'Zoey 101'?

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Sean Flynn - His most viral moment since then was a 2015 video where 10 years later his character, Chase, almost proposes to his girlfriend until he realizes he's still not over Zoey.

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Meagan Good - Who remembers the show where a puppet comes to stay with his human family? Those strange memories are thanks to 'Cousin Skeeter.'

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Meagan Good - The actress is now better known for appearing in 'Think Like A Man,' and in 2019 she tried her hand at a thriller in 'The Intruder.'

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Romeo Miller - Formerly known as Lil' Romeo, Miller was in a very on-brand show called 'Romeo!'.

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Romeo Miller - He's continued acting and making music, guest starring on 'Empire,' and he also starred in the reality series 'Growing Up Hip Hop.'

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Nat Wolff - Nat is the older half of the 'The Naked Brothers Band,' which was essentially an embellished parody of the Wolff brothers' real lives.

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Nat Wolff - He later starred in films like 'The Fault in Our Stars' and 'Paper Towns,' and performed in the Off-Broadway play 'Buried Child,' along with continuing to make music.

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Alex Wolff - This tiny star was the drummer in 'The Naked Brothers Band.'

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Alex Wolff - He grew all the way up since then, with notable roles in 'Jumanji: Welcome to the Jungle,' and the horror film 'Hereditary.' He also stars in 2019's 'Human Capital.'

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Qaasim Middleton - Don't forget the guitarist from 'The Naked Brothers Band,' who was an honorary brother.

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Qaasim Middleton - Middleton went on to play DJ Big Planet on Netflix's 'The Get Down,' and he was a finalist on Season 14 of 'American Idol.'

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Devon Werkheiser - More people in the world knew him as "Ned" from 'Ned's Declassified School Survival Guide' than "Devon" when he was growing up.

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Devon Werkheiser - He continues to give advice on YouTube, and he's also starred in several movies, including 'Sundown' and 'Where's the Money.' Plus, he's a singer-songwriter on the side.

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Lindsey Shaw - Shaw got her big break as Moze, one of the reliable best friends on 'Ned's Declassified School Survival Guide.'

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Lindsey Shaw - She went on to star in the '10 Things I Hate About You' series, and then had a recurring role on 'Pretty Little Liars.'

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Daniel Curtis Lee - Lee played the lovable nerd Cookie on 'Ned's Declassified School Survival Guide.'

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Daniel Curtis Lee - Along with this huge transformation, Lee also established himself as a rapper and reportedly graduated with honors from California State University.

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Christian Serratos - Serratos first became known as Suzie on 'Ned's Declassified School Survival Guide.'

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Christian Serratos - She later appeared in the 'Twilight' franchise, 'The Secret Life of the American Teenager' series, and 'The Walking Dead.'

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Austin Butler - Butler started as a background character on 'Ned's Declassified School Survival Guide' and later became a love interest on 'Zoey 101.'

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Austin Butler - He's since appeared in 'The Bling Ring,' 'Switched at Birth,' 'The Carrie Diaries,' and he'll be playing Elvis Presley in a forthcoming biopic. 

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Amanda Bynes - After starring on 'All That,' the young actress earned her own sketch series called 'The Amanda Show.'

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Amanda Bynes -

Unfortunately, she's since had trouble with the law, as well as struggled with drugs and alcohol addiction. 

See also: Most memorable celebrity arrests

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