It's been just two months since Jaime Pressly gave birth to her son, Dezi, but the new mom has already shed all her baby weight! Betch! How'd she do that?!

Jaime and fiance Eric Cubiche celebrated her 30th birthday -- and the return of her old body -- with an '80s glam rock-themed party in Vegas on Friday at PURE nightclub's Pussycat Dolls Lounge. Don't cha wish your mommy was hot like me!

Today is the "My Name Is Earl" MILF's actual birthday. Feliz Cumpleanos, mami!