By DAILY MAIL REPORTER
Trim and slim: Gerard Butler showed off his new physique at The Hollywood Foreign Press Association's 2011 Installation Luncheon yesterday
He caused a stir when he started piling on weight last year after wowing fans with his impressive physique in 2006 movie 300.
But it seems after adopting a rigorous diet and exercise regime, Gerard Butler may have taken his weight loss too far.
The 41-year-old actor displayed his slimmer frame in a light grey suit as he attended The Hollywood Foreign Press Association's 2011 Installation Luncheon at the Beverly Hills Hotel yesterday.
Slimmed down: Gerard looked noticeably slimmer than he did back in 2009
Butler looked noticeably trimmer around his torso area as well as his open shirt collar drawing attention to his thinner face and neck.
His trousers looked baggy around his legs and Butler's single-breasted jacket also highlighted his slimmer physique.
Butler previously went into serious training for 300, although some suggested his impeccably defined abs were entirely the result of computer trickery.
But the actor insists he worked hard to sculpt his body in preparation for the role, and was thrilled with the results.
Wasting away: Butler's open shirt collar drew attention to his thinner face and neck
He said: 'You know that every bead of sweat falling off your head, every weight you've pumped - the history of that is all in your eyes.
'That was a great thing, to put on that cape and put on that helmet, and not have to think, "S**t, I should have trained more."
'Instead, I was standing there feeling like a lion.'
However, after shooting the movie, Butler admitted he struggled to maintain the diet and exercise regime he had followed for the movie.
Taking to the stage: The actor spoke to the audience at the event
As he was: Butler shows off his defined (if slightly digitally enhanced) abs in 300