As Twilight's Rosalie Hale she is pretty uptight.
But in her own life Nikki Reed couldn't be more different, laughing away as she raced around a Hawaiian beach with her husband Paul McDonald.
The 24-year-old looked very happy as she ran into the waves with former American Idol contestant Paul, before grabbing him for a long kiss.
Her halterneck green bikini highlighted Reed's amazing figure, and Paul certainly seemed to appreciate it, giving her an appreciative glance.
The pair then swam out to join some friends on a boat offshore, with Nikki getting a helping hand climbing aboard.
She looks in such good shape and it's even got her jumping for joy!