He rose to fame as the fresh-faced star of High School Musical.
But these days Zac Efron in looking decidedly beefier - especially so after gaining 18lbs recently for a movie role.
The 23-year-old actor was pictured on the red carpet in Los Angeles last night with a noticeably fuller face and packed-out physique.
Fuller-faced: Zac Efron pictured at a Hollywood's Spot 5750 last night has gained a reported 18lbs for a movie role
He is said to have gained 1st 4lbs for his role as a U.S. Marine in the Iraq war in the film adaptation of Nicholas Sparks‘s The Lucky One.
Speaking about his weight gain to E! Online recently, he said: 'I was just eating, eating and eating.'
Zac also shaved off his hair for the role. He wrapped a 10-week filming shoot just before Christmas in New Orleans.
Now and then: Zac recently revealed he was constantly eating as he filmed the movie where he plays a U.S. Marine in the Iraq war, pictured right in July 2010
Last night the actor was pictured at the STIKS Celebrity Video Game Challenge for Charity.
The actor played it casual in a brown jacket which he wore over a black and grey shirt as he arrived at Spot 5750 in Hollywood.
Earlier in the day, Zac took was spotted running errands with a trip to an office building in Downtown Los Angeles.
Meanwhile, Zac with be joining Justin Bieber and actress Olivia Wilde to present an award at the Golden Globes in Hollywood on Sunday.
The 68th Annual Golden Globe Awards, hosted by Ricky Gervais, will air live on January 16 on NBC at 5 pm from the Beverly Hilton Hotel in Beverly Hills.
Movie role: Efron filming The Lucky One on location in New Orleans last year