Justin Timberlake: Shirtless Swimming for 'Now'!

Justin Timberlake goes shirtless as he films scenes for his new movie, Now, on Monday (January 31) in Malibu, Calif.

The actor celebrated his 30th birthday yesterday – happy birthday, JT!!

Justin swam in the ocean for a night shoot but had a lifeguard nearby just in case the water got too rough.

Now also stars Amanda Seyfried and is scheduled to be released in late October.