The singer takes charge, rocking the mic during a Black Eyed Peas performance in Melbourne. Plus: Kristin Cavallari, Jake Gyllenhaal, Gerard Butler and more


Lady Gaga isn't their only star worshipper! Singer Katy Perry – who may or may not be dating British funnyman Russell Brand – makes a statement at French designer Castelbajac's Paris fashion show on Monday, arriving in a multi-colored Muppet-patterned dress.

Lady Gaga vs. Katy Perry: tell us who wears her Muppet dress better here!