Leonardo DiCaprio

Long before he portrayed "The Wolf of Wall Street," DiCaprio was a child actor who performed in dozens of commercials like this one for Bubble Yum. Safe to assume he did, in fact, keep it popping.
Image via Frederick M. Brown/Getty Images
Lindsay Lohan

Before "Freaky Friday," "Mean Girls" and a ton of arrest warrants, La Lohan was the go-to kid commercial actor. Here, she's the freckle-faced cutie snacking on Jell-o with a pre-creepy Bill Cosby. Wasn't she cute?
Jodie Foster

She's a mom, an Academy Award-winning actress and a highly acclaimed film director, but Jodie Foster was also a totally in-demand commercial actress. Here she's proving she really can do it all, selling Crest toothpaste on a golf course. Naturally.
Mila Kunis

New mom Mila Kunis made her mark alongside future fiancé Ashton Kutcher on "That '70s Show," but the "Jupiter Ascending" actress got her start doing commercials like this, for Telephone Tammy.
Tina Fey

The Queen of Comedy got her start as the queen of commercials. Tina Fey may have a more refined (read: successful) look these days, but she's as witty and clever as ever in this commercial for Mutual Savings Bank.
Who knew there were so many ways to say "Hi"?
Steve Carell

How did "The 40-Year-Old Virgin" make it big? By selling chicken, that's how. Check out Steve Carell for Brown's Chicken. He can't help but be funny even when he's talking about chicken.
Kristen Stewart

The only thing more amazing that the young "Twilight" star getting her big break in commercials like this one for Porsche, is that the notoriously sullen actress actually smiles on camera!
And by the way, what kid wouldn't intentionally miss the bus so they could ride to school in dad's Porsche?
Stephen Colbert
The "Colbert Report" funny man seems right at home in this commercial for Nebraska's First Tier Bank. It's safe to assume that whoever hired a then-unknown Colbert got a raise, or at least VIP seats at "The Colbert Report" taping.
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Brad Pitt

He's one of the biggest movie stars of all time. But before Brad Pitt became an international sensation, he was the cute boy next door who could sell just about anything. So even though he doesn't say a word in this ad for Pringles, you still totally want to buy some, don't you? Yum.
Image via Anadolu Agency/Getty Images
Naomi Watts

The Australian beauty is known for her serious roles in independent films, but she had to get her start somewhere. And what better place to start than in commercials like this one for tampons? She may be an Oscar nominee, but Watts is unforgettable selling Tampax.
Tobey Maguire

It's hard to believe that before he was Spider-Man, Tobey Maguire was just a young actor doing commercials like this one for Atari. And though it's unclear why young Tobey has the world's largest game console in his pocket at school, if anyone can sneak a huge video game into school it would definitely be Spidey.