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Shia LaBeouf -

Shia LaBeouf revealed his best on-screen kiss in a moment of extreme pressure! He was playing 'Burning Questions' on 'The Ellen DeGeneres Show,' where he had to answer Ellen's questions after eating an insanely hot chili pepper.

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Dakota Johnson -

He admitted that his favorite kiss was with Dakota Johnson when they starred in the indie comedy 'Peanut Butter Falcon' together, gushing, "She's a sweetheart." However his confession may not have been entirely truthful...

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Zac Efron - In an interview following the release of his movie 'The Greatest Showman,' Efron was quick to say that his on-screen kiss with Zendaya might be his favorite ever!

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Zendaya - He claimed that tension between the characters created a kind of electricity. Zendaya also confirmed that every moment between the characters was "really, really incredibly special."

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Reese Witherspoon - Reese Witherspoon's comments on kissing Robert Pattinson in 'Water for Elephants' were pretty dire. "It wasn't appealing; it wasn't pleasant."

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Robert Pattinson - Apparently Pattinson had a horrific head cold during filming, and was literally "snorting and snotting through every second of it." Yuck!

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Ryan Reynolds - Ryan Reynolds was once asked what it was like to kiss his co-star Anna Kendrick in the movie 'The Voices.'

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Anna Kendrick - He responded that it was "like taking your face to Awesometown." A stellar review!

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Emma Watson -

Emma Watson's worst kiss was one of the world's favorite on-screen romances. But sadly, Ron and Hermione didn't have any chemistry off-screen! 

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Rupert Grint -

Watson was terrified to kiss co-star Rupert Grint. She was completely over-thinking it, and by the time it came to do the first kiss, she pounced on him and took him by surprise!

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Morena Baccarin -

Morena Baccarin plays the romantic lead in the comedy superhero franchise 'Deadpool.' It's no secret that many would jump at the chance to kiss Ryan Reynolds. Let's not forget, he was once voted the sexiest man alive! 

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Ryan Reynolds - Sadly, it wasn't all it's cracked up to be. Baccarin revealed that kissing him in the 'Deadpool' costume was like kissing a giant latex condom!

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Liam Hemsworth - Liam Hemsworth revealed that his worst kiss was with his 'Hunger Games' co-star and best friend: Jennifer Lawrence.

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Jennifer Lawrence -

True to form, Lawrence pranked him in every kissing scene by eating tuna or garlic right before.

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Selena Gomez -

Selena Gomez's first kiss sounds like a nightmare. The 12-year-old child star was making a guest appearance on the Disney show, 'The Suite Life of Zack & Cody.'

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Dylan Sprouse -

She had to kiss actor Dylan Sprouse in front of an entire film crew. She describes closing her eyes too early when she leaned in and missing half his mouth! Awkward. 

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Josh Hutcherson -

Josh Hutcherson is another poor soul who performed his first kiss in front of the cameras! The unlucky kid was only 11 years old. 

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Charlie Ray -

He had to kiss co-star Charlie Ray for the movie 'Little Manhattan.' He described having around 50 people standing around, as well as his dad who had to be there for parental support! Not very romantic. 

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Paula Patton -

Paula Patton starred alongside Tom Cruise in the hit action movie 'Mission Impossible: Ghost Protocol.' She had interesting feedback about their on-screen kiss! 

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Tom Cruise - She said she was surprised because Cruise had amazing breath, describing, "It wasn’t minty. It was just perfect.” Sounds like he's a true professional!

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Dane Cook - Dane Cook totally called out Kate Hudson for her bad breath on set during the filming of 'My Best Friend's Girl.' He claims she was his worst-ever on-screen kiss.

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Kate Hudson - He said that Hudson "purposely ate like a feast of onions" before their scenes. However, in the same interview he claimed that he'd slept with hundreds of groupies in his younger days, so we'll take that with a pinch of salt.

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Tobey Maguire -

Tobey Maguire's upside-down kiss with Kirsten Dunst in 'Spiderman' is one of the most famous and romantic scenes of all time. Apparently it wasn't as much fun as it looked! 

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Kirsten Dunst - Maguire said it was one of the most difficult things he had to do for the movie. He was stuck hanging upside-down with rain water going up his nose, and when Dunst rolls the mask back it completely cut off his air supply!

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Penn Badgley -

Penn Badgley's best and worst kisses were with the same actress!

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Blake Lively - During the filming of the series 'Gossip Girl' he was in a real relationship with Blake Lively, so their on-screen kisses were awesome. That changed after they broke up in real life but had to continue kissing on set..

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Miles Teller -

In another bad-breath incident, Miles Teller described his terrible encounters with co-star Shailene Woodley in the movie 'The Spectacular Now.'

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Shailene Woodley -

He claimed she was taking herbal supplements that "tasted like cr*p" before every scene. According to Woodley, Teller had a real sweet tooth and would drink Gatorade before each kiss, which she hated! Not a match made in heaven. 

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What's next? - On-screen kisses are awkward enough, but what about sex scenes? These stars refuse to bare it all.

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