Off-Duty Hollywood!

From riding a roller coaster to chilling on the beach, see how the stars – Rihanna! Gwen! Heidi! – take a day off from the set and stage

RIDING A ROLLER COASTER

Trading the studio – where she's currently working on a new album – for the amusement park, Rihanna works on her vocal range while riding the Tatsu roller coaster at Six Flags Magic Mountain in Valencia, Calif.