Same premiere, same positioning, totally different vibes. At the LA premiere of Get Him to the Greek last night, Katy Perry (in Georges Chakra and Loree Rodkin jewels) accompanied her fiance, Russell Brand, while Vanessa Hudgens served as boyfriend Zac Efron's date. While these couples have one obvious thing in common — mad love — their fashion senses are completely unique. Russell and Katy are a glam-rock duo, while Zac and Vanessa exude youthful, urban cool. Both couples worked it majorly on the red carpet, but only one pair can be most Fab.