▲While it was likely strange for Barrymore to see her ex dating a woman who can do an uncanny impression of her, both women continue to support each other.

▲The two singers' drama started around the time Perry started dating Mayer, which people assumed was the reason for their bad blood, though they've made up since.

▲Taylor Swift dated John Mayer from late 2009 until early 2010, and subsequently wrote the pretty scathing song 'Dear John.'

▲Both stars completely moved on, and chose to pursue their own lasting friendship.

▲Everything remains cool with them, as Swift reportedly even went on a double date them. Jonas presumably had gotten over the fact that Swift told everyone he'd broken up with her over a 27-second phone call...

▲Nina Dobrev met Ian Somerhalder on the set of their show 'The Vampire Diaries' in 2009. They soon became an item, but called it quits in 2013.

▲Taylor Swift and Joe Jonas had a brief relationship in 2008, and after she inducted Gigi Hadid into her girl gang, the model dated Jonas in 2015. That relationship ultimately didn't last.

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Later, fellow vampire and 'Twilight' star Nikki Reed, who had been friends with Dobrev, started seeing Somerhalder and eventually they married. Dobrev reportedly remains friendly with the two.

▲Emma Roberts started dating actor Alex Pettyfer after meeting on the set of 'Wild Child' in 2008, and he reportedly got a tattoo of her name on his finger, though the relationship didn't last.

▲Later, Roberts' friend and 'Glee' actress Dianna Agron started seeing Pettyfer after meeting on the set of 'I Am Number Four' in 2011. They dated for a short time before calling it quits. Agron and Roberts appear to be fine, and were even pictured together at a Glamour event in 2013.

▲Katy Perry, who was previously very friendly with Swift, later dated Mayer on-and-off from 2012 to 2016.

▲The two became friends following 2004's 'Collateral,' and Foxx was reportedly Cruise's shoulder to cry on once his relationship with Katie Holmes came to an end in 2012.

▲Selena Gomez was romantically linked to Taylor Lautner for a short time in 2009. Later that same year, her pal Taylor Swift dated him after meeting on the set of 'Valentine's Day.'

▲Just a year after Hutcherson and Deutch called it quits, Jogia was linked to Deutch, and the two became inseparable for five years before ending things "amicably" in 2017.

▲The actors have been close for years, having appeared in each other's Vine videos as far back as 2008. Then in 2012, Hutcherson started dating actress Zoey Deutch.

▲Barrymore had dated Luke Wilson for two years, and they broke up so amicably that she had no problem casting him in 'Charlie's Angels.' Shortly afterwards, Wilson was linked to Gwyneth Paltrow, following 2001's 'The Royal Tenenbaums,' for about a year.

▲Actors Michael Sheen and Kate Beckinsale had an eight-year relationship, as well as a daughter, before they split in 2003.

▲Not only are the women friends, but they actually share a godfather: Steven Spielberg. They remain close, and have even been pictured at Goop Summits.

▲Comedian Sarah Silverman later dated him in 2014, though that ended as well. Silverman and Beckinsale actually joked about it on Instagram!

▲Many know that Eric Clapton was enamored with English model Pattie Boyd while she was still married to George Harrison. During that time, Harrison reportedly wrote the Beatles' 'Savoy Truffle' for Clapton because of his sweet tooth.

▲After Harrison and Boyd had divorced, Harrison actually gave Boyd and Clapton his blessing, and appeared at their wedding too. But the new couple split after 10 years of marriage in 1989.

▲In 1958, 'Singin' in the Rain' star Debbie Reynolds saw her husband in the arms of their friend, Elizabeth Taylor, whom he claimed to be consoling following the death of her husband.

▲Soon after the divorce was finalized, Sambora and Richards were in a full-blown relationship. It didn't last, and neither did her friendship with Locklear.

▲Two years later, Longoria's 'Desperate Housewives' co-star Teri Hatcher dated her ex for just under a year.

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They've both moved on from Kay, but there are still some rumors floating around about nastiness between these two.

Check out some more serious drama between celebrity friends here.

▲Taylor and Fisher eventually married, but later divorced in 1964. In 1966, Reynolds and Taylor reportedly wound up on the same ocean liner, and decided to talk everything out. The two made up and even starred together in 2001's 'These Old Broads.'

▲Eva Longoria and Stephen Kay dated in 2004 after he directed her in the TV movie 'The Dead Will Tell.'

▲Drew Barrymore and Strokes drummer Fabrizio Moretti had a serious relationship for a few years, which ended in 2007.

▲In a huge twist, Foxx ended up with Holmes, keeping things under the radar for years. In 2019, however, they called it quits.

▲After Kristen Wiig had perfected her impression of Barrymore on 'Saturday Night Live,' and it was all laughs between them, she started dating Moretti around 2012. They broke up little over a year later.

▲Kylie Jenner reportedly dated Cody Simpson in 2011.

▲A few years later, Gigi Hadid—a good friend of the Jenners—dated the singer as well, and they stayed together on-and-off for two years.

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Patric and Roberts didn't last, but by some miracle, Sutherland and Patric were able to repair their friendship. They finally opened up about the painful love triangle on a podcast in April 2021. Patric told the host "The truth where I’m coming from: you fall in love, you fall in love. There's nothing you can do about that." Both of Roberts' exes say they have moved on.

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Kiefer Sutherland and Julia Roberts kicked off the '90s as a power couple, organizing a whirlwind marriage. On the day of the wedding, however, Roberts had ran away to Ireland with Sutherland's good friend and previous co-star, Jason Patric.

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Jennifer Aniston dated Counting Crows front man Adam Duritz in 1995 for a brief time, and two years later her 'Friends' co-star Courteney Cox dated him too.

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When we first dive into the world of romance, we rely heavily on the advice of friends, and with that comes some rules to keep things in order. What we're talking about is the infamous "code," wherein you cannot date your friend's ex. It may be a bit too strict, but it was established to protect our friendships.

In Hollywood, however, the same dating rules do not apply. Because it's such a small world and everyone is connected, and because celebrities simply like to date other celebrities, many end up dating the same people, some of whom share a lot of history with a good friend.

Drake and Kanye West only became friends in November 2021, when they buried the hatchet of their longstanding, messy feud with some smiling photos together at the Toronto rapper's house. But now it seems their truce is being tested, as it was revealed that Julia Fox had a secret romance with Drake before she started dating Kanye West at the beginning of 2022, Page Six reports.

Drake reportedly reached out to Fox on Instagram to compliment her on her role in 'Uncut Gems' (2019), and they kicked off their relationship in February 2020, with Fox even going to stay with him in Toronto until the pandemic hit and she had to return to the US. Fox then got back together with Peter Artemiev, with whom she had a baby before calling it quits and getting with West. Sources say Ye, who performed with Drake in December, is not pleased about the news.

Click through to see which stars have dated their friend's ex, and if it was worth it in the end...

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Both women moved on from Lautner, and despite some bumps along the road, the two remain close, supportive friends.

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Richards and Locklear were reportedly good friends, even double dating when Richards was married to Charlie Sheen and Locklear was married to Bon Jovi's Richie Sambora. But in 2006, Locklear reportedly divorced Sambora because she didn't like how close he was to Richards.