It was the BATTLE OF THE REBOUNDS in Hollywood last night ... with Sean Penn and his ex-wife Robin Wright each hitting the town with their new hot significant others -- but who came out on top?
Robin hit up RivaBella on Sunset with her "Lone Survivor" fiance Ben Foster -- he's attractive.
Sean went to his Help Haiti Home gala with new rumored GF Charlize Theron -- she's also attractive.
It's been almost 3 years since Sean and Robin finalized their divorce, but you KNOW they're judging each other's rebounds ... because that's what exes do.
So, we gotta ask ...