20 celebs you never knew starred in TV shows 👀

Before Chris Pratt became a mega Hollywood star, he actually played a short role in the American hit series, The O.C. You're remembering him now - the shaggy-haired, tree hugging environmental activist, Che Cook, who takes his 'soulmate', Seth Cohen, on a trippy adventure to the woods - oh so boho.

Let's throw it back to 2002 and Selena Gomez's Disney Channel days. When she was just a kid, she was on set with the big purple dinosaur in Barney and Friends. It's also where she met pal Demi Lovato.

"What's the matter, you never seen a 50-year-old stripper cry before?" - Danny DeVito's most iconic line in his 'raunchy' appearance on Friends as a male stripper. The 5ft and rather round Danny (playing Roy) turned up to Phoebe's bachelorette party dressed as a police officer - as you can imagine, it all ended in tears.

Ed Sheeran swapped his guitar for a suit of armour while playing a Lannister soldier in an episode of Game of Thrones - obviously he was made to sing.

Demi appeared in one episode and played a paranoid schizophrenic teenager named Haley May. But, this "crazy woman" diagnosis turned out to be wrong. Hayley actually had small hole in her inner ear, making her extra sensitive to sound - no wonder she wanted to claw her eyes out (literally).

How could we forget the "Finger Lakes Guy"? Jim Carrey played a character interviewing for the job of Regional Manager in season 7's final episode. He became known as the "Finger Lakes Guy", constantly obsessing over making it back to Finger Lakes.

Victoria Beckham plays herself in an episode titled "A Nice Day for a Posh Wedding" - we like what you did there. Obviously she steals the show, which rather upsets Willie on her big day.

Sir Ian McKellen walked Corrie's cobbled street as a con-merchant 'novelist' , appearing in 10 episodes.

Remember seeing Usher play 'The Love Doctor'? Nope, didn't think so. Usher appeared, dressed head to toe in white, singing love-guru advice to Sabrina.

Oops, she did it again! If you didn't love Britney enough already - she's even made guest appearance on HIMYM as the receptionist, Abby, at dermatologist Stella's office. She had a crush on Ted, then swiftly moves on to Barney.

Paris Hilton played the demonic creature taking the form of… wait for it...herself (LOL)

The current President of the United States has actually made many cameo appearances in shows such as The Fresh Prince of Bel-Air and films Zoolander and Home Alone.

Matt Damon sings? Yes, yes he does. Spotted in the 2002 episode playing Owen, and competing against Jack for a spot in the Gay Men's Choral.

Before they were the biggest supermodels on the catwalk, they were the teenage daughters of Yolanda Hadid featured on The Real Housewives of Beverly Hills.

In her pre-stardom days, Lady Gaga appeared in The Hills. Lauren Conrad and Whitney Port were tasked with styling her before a solo performance. They referred to her as just "some girl named Lady Gaga" - if only they saw her now.

Do you remember The Simple Life? Do you remember that Kesha and her mum featured on The Simple Life? Crazy, right? There she became bffs with Paris Hilton, and later wrote a song called "Paris Hilton's Closet", inspired by the time she chundered in her wardrobe.

Flashback to when Emma Stone was just 16, she competed on reality TV singing songs.

Ri Ri made two appearances in Bates Motel. She played the role of Marion Crane, appearing in a steamy sex scene and is spied on in the shower by Norman Bates. Rather than killing off Marion Crane, like in the original movie, there is a major plot twist - instead of our girl Ri Ri getting murdered - her ex-boyfriend is stabbed instead.

Former First Lady, Michelle Obama, played herself in Parks and Recreation as a speaker at the National Parks Conference pledging to end childhood obesity. We just love her.

Taylor had a small part in hit US comedy New Girl, playing the character of Elaine who is a guest at the wedding of Shrivrang and Cece. Taylor confesses her love for Shivrang and they run away together - but don't worry, Cece isn't heartbroken as it turns out she wanted to call the wedding off too!