Diaz (left) and Cooper
James Devaney/WireImage; Jason LaVeris/FilmMagic
Bradley Cooper admits he's pretty chummy with Cameron Diaz
, who has been on the actor's arm around New York the past month.
"I think she's great," Cooper told PEOPLE at Saturday's Nip/Tuck
season 5 premiere in Hollywood. "We're good friends."
Cooper, 32, and Diaz, 35, were photographed on the sidelines of Sept. 30's Giants-Eagles NFL game alongside Ashton Kutcher
(Diaz's What Happens in Vegas ...
costar) and Demi Moore
. The two also looked cozy during a recent stroll through Central Park and during a Saturday Night Live
Cooper, who split with wife of four months Jennifer Esposito in May, appears next in 2008's He's Just Not That into You
, opposite Jennifer Aniston
and Drew Barrymore
Of his burgeoning movie career, Cooper told PEOPLE, "I'm sort of nomadic. I love going on location. The 9-to-5 aspect, and the no-end-in-sight aspect of TV, is not exactly in tune with what I like to do." – Nicholas White