Ashley Benson -- Letting Loose In Mexico ... Check Out My Bikini (PHOTOS)

The summer may be over but don't tell that to "Pretty Little Liars" star Ashley Benson who busted out her sexy bikini for her trip down to Mexico.

The Kiini two piece has been popular all summer, with Heidi Klum rockin' the same skimpy suit a couple months back.

No need to ask who won this battle of the bikinis ... we all win.