1. Long before she won any Academy Awards, Jennifer Lawrence played a girl whose mum was shot dead in Cold Case. CBS / Rich Fury / Getty Images The woman who played her mum in the episode also played Katniss's mum in Hunger Games. What a coincidence! 2. A young Idris Elba made a quick appearance in British comedy show Absolutely Fabulous. BBC/ Emma McIntyre / Getty Images He played an escort who made some bold hat choices. 3. Jennifer Aniston played a charming hospital volunteer in an episode of the sci-fi show Quantum Leap. NBC / Jon Kopaloff / Getty Images Her appearance as Kiki Wilson aired the same year as Friends started. 4. Meanwhile, Matthew Perry played a tennis prodigy in the first season of Beverly Hills 90210. Fox / Angela Weiss / Getty Images He was only in one episode but he had quite the storyline — the son of one of the richest men in the OC who ended up being admitted into a psychiatric facility. 5. Emilia Clarke's first TV role was on the daytime soap Doctors. BBC / Roy Rochlin / Getty Images She played a uni student who was being stalked by her own dad. 6. We all know that Ryan Gosling was a Disney kid, but he was also in an episode of Goosebumps. Fox Kids / YTV / Shannon Finney / Getty Images In the wittily named episode "Say Cheese and Die," he played a kid who loves taking photographs but is convinced his camera is cursed. 7. Pre Step-Up Channing Tatum rocked this look in an epsiode of CSI: Miami. CBS / Lars Niki / Getty Images Channing played a wannabe rapper who may or may not have stolen a boat. 8. And Taylor Swift was in an episode of CSI, which is pretty random. CBS / Frazer Harrison / Getty Images A young Tay Tay played a teenager who, in classic CSI fashion, was murdered. 9. Before she was Annaliese Keating, Viola Davis was also in an episode of one of CSI's many iterations. CBS / Jesse Grant / Getty Images She played an attorney in CSI: Crime Scene Investigation. Foreshadowing much? 10. Lady Gaga played a girl who led Tony's son astray in The Sopranos. HBO / Presley Ann / Getty Images She was only 15 when she made her appearance and her role was uncredited. 11. Olivia Colman had a tiny role in the original version of The Office. BBC / Kevin Winter / Getty Images She proved her comedy genius when she played Helena, a journalist writing a piece on David Brent. 12. Like many other Canadian stars, Shay Mitchell made a lil' appearance in one episode of Degrassi: The Next Generation. CTV / David Livingston / Getty Images She was a high school dropout turned model. 13. A fresh-faced Brie Larson was in one episode of Ghost Whisperer. CBS / Kevin Winter / Getty Images She played a student at a haunted high school. 14. Lil' Leonardo DiCaprio had one uncredited role in Roseanne. ABC / Kevin Winter / Getty Images He had no lines, and it was a bit of "blink and you'll miss it" kinda role. 15. Way before Get Out, Daniel Kaluuya was in an Easter special of Doctor Who. BBC / Emma McIntyre / Getty Images His character, Barclay, was stuck on a random planet after the bus he was on went through a wormhole. 16. Adam Driver played a creepy guy in Law & Order. NBC / Emma McIntyre / Getty Images His shady character Robby was arrested for murder. He also played another creepy guy in Law & Order: SVU. 17. Brad Pitt was in four episodes of Dallas back in the day. CBS / Amy Sussman / Getty Images He played Randy, Charlie's boyfriend. 18. Tiffany Haddish had a little part in the Disney classic That's So Raven. Disney Channel / Dimitrios Kambouris / Getty Images She played a tour guide in a biodome, and even though her character didn't even have a name, she was just as funny back then. 19. One of Rooney Mara's first acting roles was in ER, as a woman who abandoned her baby. NBC / Christopher Polk / Getty Images She appeared in two heartfelt episodes alongside Angela Bassett. 20. Long before she was kicking ass, Chloë Grace Moretz was in two episodes of Desperate Housewives. ABC / Jon Kopaloff / Getty Images She played Sherri, a beauty pageant contestant who was caught in the crossfire of one of Gaby's scheming plans. 21. And finally, before he was being a creep in YOU, Penn Badgley played a bully in Will And Grace. NBC / Cindy Ord / Getty Images It was his first-ever role, and he looks almost unrecognisable. Whose bit-part do you remember? Let us know in the comments!