Holy Abs!: When you do a trillion crunches and leg-lifts, you have every right to show them off. But Christina Milian's ab-baring styles in the early years of her career pushed the boundaries of good taste. Case in point: On stage in 2004, she performed in a cropped top and jeans so low that one false move could show how thorough her bikini wax was or wasn't. Whether it's in gleaming white or seductive black, Christina doesn't let you forget how astoundingly toned her abs are. And...release!

Cassie Ventura—who’s strictly on a one-name basis with her fans—paired a white, body-hugging Pencey dress with gladiator pumps for Madison Square Garden’s “NYC Sound Tracks” party. Seems the Bad Boy songstress was unfazed by the fact that Gossip Girl actress Leighton Meester wore the same dress in olive to a movie premiere in April. Vote on the more stylish starlet!