Gerard Butler sweats gym

Well, they may not look quite like they did back in 300, but Gerard Butler is definitely determined to get his hot bod back!

After getting out of rehab last month, the Scottish star has been spotted spending time with his parents, going out to dinner and catching the Lakers play, and he's also gearing up for his new movie role, in Hunter Killer.

According to IMDb, the flick is about an American submarine captain who "teams up with U.S. Navy Seals to rescue the Russian president, who has been kidnapped by a rogue general." Sounds like he'll be kicking some serious butt ... no wonder he's getting back in the gym!