Ken Jeong, 'Knocked Up'
Before he joined the wolf pack in 'The Hangover' franchise, Jeong was a physician. He had the perfect background for his role as a doctor in 'Knocked Up.'
Jeremy Irvine, 'War Horse'
Steven Spielberg wanted an unknown actor to play the lead in 'War Horse,' and Irvine was as unknown as it gets. Before his big break, he tried to enlist in the army but was rejected after lying about having diabetes.
Gabourey Sidibe, 'Precious'
Before winning awards for her role in 'Precious,' Sidibe worked at the Fresh Air Fund's office as a receptionist.
Rebecca Romijn, 'X-Men'
This blue beauty was actually a model before landing her first role as Mystique in the 'X-Men' franchise.
Nikki Blonsky, 'Hairspray'
Before singing about life in the 60s in the reboot of 'Hairspray,' Blonsky was scooping ice cream at ColdStone Creamery.
New Line Cinema
Suraj Sharma, 'Life of Pi'
Sharma wasn't even supposed to audition for 'Life of Pi'... he was only there because his little brother who was auditioning requested that he come with. He was a student in India before Ang Lee chose him for the role.
20th Century Fox
Kenny Wormald, 'Footloose'
This dancer won numerous awards in New England before moving to LA. He was a back-up dancer for Justin Timberlake and The Pussycat Dolls before starring in the remake of 'Footloose.'
Allison Williams, 'Girls'
The daughter of NBC News anchor Brian Williams caught Judd Apatow's attention when her YouTube video mashup went viral. He then cast her as one of the leads in 'Girls.'
Sean Connery, 'Dr. No'
Before becoming Bond, James Bond, Connery was a milkman, a lifeguard, a bodybuilder, a coffin polisher, and a member of the Royal Navy.
Angie Harmon, 'Law and Order: SVU'
Harmon was a famous fashion model before her breakout role on 'Law and Order.' She now stars in TNT's 'Rizzoli and Isles.'