Lt. Lisa Foiles from The Angry Joe Show. She went on a rant and her uniform started falling apart.
Not to say she's conceited or anything, but Lisa seems to be fully aware of the fact that she's... visually pleasing and isn't afraid to flaunt it. Just get a look at Episode 3 of her "Everyday Achievements" series or her video with Angry Joe from E3 where the caption underneath reads "Hot Chick".
She displayed awareness of this fact in her top 5 best moments of Monkey Island, pointing out she wears tight clothing while wearing tight clothing. The comments section on the Escapist were really... happy about it.
What's worse, Yang herself is intelligent and ruthless enough to exploit her status as a Ms. Fanservice for all it's worth. In her trailer, after she strolls into a Bad-Guy Bar and pisses off the mafia boss inside, she playfully suggests kissing him to make it up to him. The sucker leans in with his eyes closed, and...◊
Also from RWBY, Pyrrha Nikos◊. Her combat outfit is even skimpier than Yang's, featuring a miniskirt, corset, low neckline, and thigh-highs. She's also noticeably taller, curvier, and more athletic than most of the other girls at Beacon. Jaune is a terribly lucky guy.