January Jones!On Thursday, the "Mad Men" actress left little to the imagination while going braless in a plunging red jumpsuit for a pre-Oscars fashion event.January epitomized glamour at the Net-a-Porter-sponsored party with 70's-era bob cut, classic red lipstick and black eyeliner. Still, the jumpsuit, paired with white pumps, was the highlight.A post shared by January Jones (@januaryjones)"Who does she think she is?" January jokingly captioned an Instagram snap of the look.