The sisters share some twin time in L.A. Plus: Ben & Jen, Jude Law, Matt Damon and more

WIGGED OUT

No, Hilary Duff hasn't gone to the dark side: She's just wearing a brunette wig while singing her hit "Wake Up" on The Tonight Show with Jay Leno in Burbank, Calif., on Monday. (The blonde singer-actress wears a similar hairpiece in her video for the song.)