The actor, who started dating the 'Two Weeks' hitmaker last September and got engaged in April, is reportedly having the time of his life with the British beauty.

A source close to the 'Rover' star said: "They are very cute together and have great energy, Rob seems very happy. FKA seems to be a great fit for Rob. [They] seem to enjoy the same things."

The former 'Twilight Saga' star and the singer, who are currently living in his Beverly Hills home, work out together with celebrity trainer Harley Pasternak "almost daily" and "enjoy walks around Venice Beach."

The insider told PEOPLE.com: "[They are] generally very active [and] both seem to enjoy staying fit."