When it comes to acting, all our favorite celebs had to start somewhere.

As much as we'd all like to dream, becoming an award-winning movie star doesn't exactly happen over night.

For most actors, it can take quite a lot of time (and hard work) to make a name for yourself in the industry. So it's no wonder that some of the biggest stars made their start playing minor roles or even as extras. (And why you may not have noticed them.)

Watch the trailer for Suddenly 30, a film which features two actresses that might surprise you. Post continues below.

Here are 13 celebrities you never realised were in THAT movie.

Ryan Gosling inRemember The Titans

Before we fell in love with him onThe Notebook, Ryan Gosling played fresh faced footballer Alan Bosley inRemember The Titans.

Julianne Hough inHarry Potter And The Philosopher's Stone

Back in 2001, Julianne Hough and her brother Derek appeared as extras inHarry Potter And The Philosopher's Stone.

Julianne later told People that she had a crush on Daniel Radcliffe while filming.

"I gave him a love note and a Beanie Baby for Valentine’s Day," she told the publication. "I didn’t personally give it to him because I was just an extra, but I gave it to his assistant or PA that was working with him. I don’t know if he ever got it."

John Krasinski inThe Holiday

Yep,The Office'svery own John Krasinski makes an appearance in the cult classic Christmas film. Krasinski plays Ben who works with Cameron Diaz's character, Amanda.

Scarlett Johansson inHome Alone 3

Back in 1997, Scarlett Johansson played Alex’s older sister, Molly, inHome Alone 3.

Rami Malek inNight at the Museum

Before winning an Oscar for his portrayal of Freddie Mercury inBohemian Rhapsody, Rami Malek played Egyptian Pharaoh Ahkmenrah inNight at the Museum.

Leonardo DiCaprio inRoseanne

If you go back and watch season three of hit American sitcomRoseanne,you may spot a young Leonardo DiCaprio playing one of Darlene's Classmate.

Ashley Benson and Brie Larson inSuddenly 30

Ashley Benson and Brie Larson both played one of the Six Chicks in 2004 film Suddenly 30.

Selena Gomez inSpy Kids 3-D: Game Over

Selena Gomez played Waterpark Girl in the 2003 filmSpy Kids 3-D: Game Over.

Stan Lee inThe Princess Diaries 2

Stan Lee is no stranger to cameos. But his brief appearance as a wedding guest inThe Princess Diaries 2still catches people off guard.

Kirsten Dunst inJumanji

Kirsten Dunst was only 13 years old when she played Judy Shepherd in 1995 filmJumanji.

James Marsden inThe Nanny

One of James Marsden's early television appearances was on hit American sitcomThe Nanny,where he played Maggie's suitor.

Simon Helberg inA Cinderella Story

Before landing the role of Howard Wolowitz inThe Big Bang Theory,Simon Helberg played nerdy high school student Terry inA Cinderella Story.

Feature Image: Universal Pictures/20th Century Fox.