Celebrities are really just like us -- they have to work out and eat well in order to be fit. But that doesn't stop us from wanting to know all their secrets! And here at That's Fit, we work hard to keep you up to date on all the exercise and diet-related celeb gossip. Click on the famous faces above to see what your favorite star is up to!

Celebrities slimming down for a film is nothing new, but one would hope they'd do it in the healthiest way possible -- after all, yo-yoing weight is unhealthy enough as it is. Hunky Irish actor Colin Farrell recently slimmed down dramatically for his role in the upcoming film Triage. How did he do it? Here's what he ate each day according to FitCeleb:

• Two cans of tuna
• Black coffee
• Diet Coke
  

That's it. That's about a net caloric intake of 300 calories a day. No wonder he lost 44 pounds. Though Farrell previously said his weight loss was healthy, he's changed his tune -- he now admits that his weight loss was not 'healthy' or 'advisable.' No kidding, huh? He has since gained it back: "I just ate like a pig,'" the actor says.

This is probably the least healthy way to slim down, don't you think?

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Reporters at a recent press conference in Spain were nothing but stunned when actor Colin Farrell appeared at the event looking shockingly thin.

Why the major transformation for this Hollywood bad boy?

"I lost weight because my role demanded it," said the 31-year-old of his upcoming film, Triage. "It was all very healthy."

It was a few sentences from the Scott Anderson novel that inspired Farrell's drastic slim-down: He went to the bathroom to shave. Once his beard was gone he saw that his face had become drawn. He pressed at the hollows beneath his eyes, the pronounced nubs of his cheekbones.

Farrell, not willing to fess up to his weight-loss secrets, plays a war reporter in Bosnia in this new film and spent five weeks perfecting his character.

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