12 Celebrities You Didn't Know Were BFFs IRL

Some of your best on-screen BFFLs are the best of buds offscreen too! Here's a list of some of the coolest friends in Hollywood, and for more bestie action be sure to check out This Is The End in theaters Wednesday, June 12th!

1. Danny McBride and James Franco

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How long they've been friends: These guys met on the set of Pineapple Express and hit it off.

What they've starred in together: Your Highness, Pineapple Express, This is the End

Fun Fact: Danny wrote the script for Your Highness and James' interest in the film stemmed from his love of the fantasy movie "The Dark Crystal" as a child.

2. Jada Pinkett Smith and Tom Cruise

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How long they’ve been friends: Tom and Jada were already friends before they appeared together in Collateral in 2004.

What they’ve starred in together: Collateral

Fun Fact: Tom introduced Jada and her husband, Will Smith, to Scientology. The two haven't admitted to practicing the religion but Will has said, "I was introduced to it by Tom, and I'm a student of world religion. I was raised in a Baptist household. I went to a Catholic school, but the ideas of the Bible are 98 per cent the same ideas of Scientology, 98 per cent the same ideas of Hinduism and Buddhism."

3. Channing Tatum and Jamie Foxx

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How long they’ve been friends: The two met while filming this year's movie White House Down.

What they’ve starred in together: White House Down

Fun Fact: When Channing had his first baby, Jamie was one of the first person to tweet a congrats! Adorbs.

4. Tina Fey and Amy Poehler

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How long they've been friends: These ladies met in an improv class at Chicago's ImprovOlympic in 1993.

What they've starred in together: Saturday Night Live, Baby Mama, Mean Girls

Fun Fact: In regards to Tina, Amy once said, "I remember Tina Fey wrote a play about Catherine the Great f***ing a horse and I thought 'That lady is hot stuff, I wanna know her.'"

5. Donald Faison and Zach Braff

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How long they've been friends: These two met on the set of the show Scrubs in 2001 and have been inseparable since.

What they've starred in together: Scrubs

Fun Fact: Zach was a groomsman in Donald's wedding last fall. Aww.

6. Drew Barrymore and Cameron Diaz

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How long they've been friends: The ladies met at a coffee shop when Cameron was just starting out in the acting business.

What they've starred in together: Charlie's Angels, Charlie's Angels: Full Throttle

Fun Fact: Drew often refers to Cameron as her "big sister" due to their super close relationship. So cute!

7. Justin Timberlake and Jimmy Fallon

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How long they've been friends: These guys have been friends since Justin first hosted Saturday Night Live in 2003.

What they've starred in together: Saturday Night Live

Fun Fact: During Justin's speech at his own wedding, Jimmy apparently heckled the groom into laughter. Justin said, "Then there was Jimmy, shouting a joke from his seat, sparking an improv between the two of us that went on for a good five or 10 minutes and had all our guests roaring with laughter.”

8. Rihanna and Katy Perry

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How long they've been friends: In 2009, Katy complimented Rihanna on a purse she was carrying and Rihanna sent her the same bag in the mail. Since then, they've been BFFs.

Fun Fact: Rihanna threw Katy a bachelorette party when she was engaged to Russell Brand and stuck around to comfort her after the divorce. What a gal.

9. Demi Lovato and Selena Gomez

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How long they've been friends: The two met on the set of Barney and Friends in 1999, then later while filming their shows for the Disney Channel.

What they've starred in together: Barney and Friends

Fun Fact: Demi has recently gushed about Selena stating that she was one of the only people in her life who was there after her tough times. That's a real friendship.

10. Robert Pattinson and Reese Witherspoon

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How long they've been friends: This pair met on the set of Water for Elephants in 2011.

What they've starred in together: Water for Elephants

Fun Fact: Reese is one of Rob's besties, despite the fact they are 10 years apart. Rob also crashed at Reese's house during his break-up with actress Kristen Stewart.

11. Seth Rogen and James Franco

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James is so popular that he made the list twice!

How long they've been friends: This hilarious duo met on the set of the show Freaks and Geeks in 1999.

What they've starred in together: Pineapple Express, Freaks and Geeks, This is the End

Fun Fact: In their upcoming movie This is the End, James is so obsessed with Seth that he continuously paints portraits of him. We hope there's some truth to that.

12. Kristen Stewart and Taylor Swift

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How long they've been friends: New bonus BFF alert!

Fun Fact: Kristin Stewart was very recently seen staying at Taylor's house after her split with Robert Pattinson.

Check out BFFs Seth Rogen, James Franco, Danny McBride, Jonah Hill, Craig Robinson and Jay Baruchel all playing buddies in "This Is The End" – In Theaters Wednesday, June 12