Popsugar Entertainment Avengers Endgame Was Brie Larson in 13 Going on 30? On the 15th Anniversary of 13 Going on 30, Some Fans Are Just Realising This Crazy Casting Fact 23 April 2019 by Erin Cullum Image Sources: Getty / Valerie Macon and Everett Collection Believe it or not, it's the 15th anniversary of 13 Going on 30, which was released on April 23, 2004. If you watch it for the 200th time (as one should), you might notice something you hadn't before: Brie Larson is in it. She was one of the Six Chicks — yes, the mean girls with the side ponies — led by Judy Greer, aka "Tom-Tom." There's a chance you already knew that, but someone who didn't is Larson's current costar, Mark Ruffalo, who, of course, is 13 Going on 30's main star besides Jennifer Garner. Because Larson had a smaller role, the two never worked together directly on the movie, and Ruffalo just learned about the connection while on the red carpet premiere of the pair's new movie, Avengers: Endgame. Pretty crazy, huh? Before Larson was an Oscar-nominated actress with leading roles in Room and as Captain Marvel, she was in smaller movies including Sleepover and Hoot. Larson reflected on her time filming 13 Going on 30, telling Entertainment Tonight, "It was the moment when I realised I really wanted to direct." In honour of the movie's anniversary, Jennifer Garner also posted a really sweet tribute honouring the film and the cast. Ahead, jog your memory and see the moment Ruffalo realised he and Larson were in the same iconic rom-com. Related: We Have to Give Snaps to Scarlett and Brie For Their Jewels at the Avengers: Endgame Premiere Behold: Brie Larson as a Six Chick! I WAS TODAY YEARS OLD WHEN I FOUND OUT THAT @brielarson WAS ONE OF THE SIX CHICKS FROM 13 GOING ON 30 pic.twitter.com/cADxOB1p9z— 𝐟𝐥𝐨𝐧𝐢 🦕 (@flonimae) April 20, 2019 1 / 8 The Moment When Mark Ruffalo Found Out Fun fact #1: Brie Larson was in ‘13 Going on 30’ with Mark Ruffalo Fun fact #2: He was just as shook as we were! 😭 #AvengersEndgame pic.twitter.com/nMXs26vOJp— Entertainment Tonight (@etnow) April 23, 2019 2 / 8 What Brie Took Away From 13 Going on 30 Did you know that her role in ’13 Going on 30’ was the moment @brielarson knew she wanted to direct?! 😱🎥 #AvengersEndgame pic.twitter.com/vhHVty7zkK— Entertainment Tonight (@etnow) April 23, 2019 3 / 8 (Ashley Benson Was a Six Chick, Too) yo i've just rewatched 13 going on 30 and i still can't believe that brie larson was one of the six chicks pic.twitter.com/2YHnBLRQsZ— Lucky Rangel Baniqued (@lucky_rangel) April 14, 2019 4 / 8 A Lot of People Had No Idea Things that have shocked me today1.13 going on 30 is fifteen years old 😱😱2. Brie Larson was a six chick— 🧡 Sara Burgess 🧡 (@SaraBTweet23) April 23, 2019 5 / 8 A True Revelation Omg. I just learned that @brielarson was a Six Chick in 13 Going on 30 and my life will never be the same.— MaiLinh (@MaiLinhsTweets) April 23, 2019 6 / 8 Jennifer Garner Posted a Long Tribute in Honour of the Anniversary View this post on Instagram A post shared by Jennifer Garner (@jennifer.garner) on Apr 23, 2019 at 11:43am PDT 7 / 8 We'll Raise Some Razzles to That Image Source: Everett Collection 8 / 8 Avengers EndgameNostalgiaMoviesBrie LarsonMark Ruffalo