From PEOPLE Magazine Click to enlarge
1990

2010

2011

ALEC BALDWIN

Two decades after playing a CIA agent in The Hunt for Red October, the actor, 53-now dating yoga instructor Hilaria Thomas, 27-has leaned up on a fish-centric, no-sugar diet.

2004

2005

2011

JUDE LAW

The Brit, 38, veered from Oscar nominee to tabloid scandal king. "My 30s have been about reevaluating," he said recently. "And my 40s and 50s, I think, will be a really interesting time."

2002

2005

2011

COLIN FARRELL

After capping off his Hollywood bad-boy years with a rehab stint, the Irishman, 35, has rediscovered the joys of exercise. "I actually like the gym," he told USA Today. "I find peace in it."

2008

2010

2011

GERARD BUTLER

The Scotsman, 42, who famously flaunted his physique in the epic film 300, suffered a period of self-confessed "pig-out binges" before starting up a routine of yoga and surfing.

1997

2010

2011

VINCE VAUGHN

The Jurassic Park heartthrob, 41, who credited his weight gain to quitting smoking and a weakness for "pasta and steaks," has slimmed down since getting married last year.

2000

2008

2011

RUSSELL CROWE

The former Gladiator, 47, said, "Bring on the burgers, baby!" to get his weight up for Body of Lies. Now he tweets workout updates: "highest bench 225 lbs.... Slowly getting stronger."