The 21-year-old blonde beauty is getting very comfy stateside.
"I kind of quite like it here," Waterhouse told me exclusively at last night's launch party for British Airways' new Airbus A380 at a private estate in the Hollywood Hills. "It's rather nice. I'm not missing much about England right now."
Sounds like she has what it takes to be a California girl.
"The beach and space, the hiking—I really like the hiking," Waterhouse said of what she enjoys about L.A. "I've been going to Will Rogers park [in Santa Monica]. It's amazing.
"I'm really happy," she smiled. "I like it here."
Cooper and Waterhouse were first linked together in March. They were spotted in Boston followed by sightings later in the year at Wimbledon and then in a Paris park about a month ago.
Last night's party also celebrated Variety's new 10 Brits to Watch list. Also there were Kelly Osbourne and her fiancé Matthew Mosshart, The Daily Show's John Oliver, Georgia King, Anna Friel and Tuppence Middleton. Gabrielle Aplin and Louisa Rose Allen performed.
True Blood star Stephen Moyer revealed to us that he and wife Anna Paquin will soon be packing up and relocating the family to New York City for about two months for his work opposite Carrie Underwood in NBC's upcoming production of The Sound of Music.