Who: Rosie Huntington-Whiteley

When: Wednesday, January 20th.

Where: The launch of Jennifer Lopez's residency at Planet Hollywood Resort & Casino in Los Vegas.

What: The sexy supermodel paired a pair of Frame leather leggings with a cherry-printed silk shirt and black jacket.

Why: Why compete with Jennifer Lopez when it comes to tight, sexy, sequined clothing? Huntington-Whiteley played the leather card, and ultimately won.