Sophia Bush, Emma Roberts, and Shay Mitchell channeled the original Material Girl when they attended Madonna's concert at AX Armani Exchange’s takeover of HYDE Lounge at the Staples Center in Los Angeles. "Just vogueing at #Madonna 's concert, #NBD. Girls just wanna have fun!" the Pretty Little Liars star (in Armani Exchange) wrote when she posted a photo of herself dancing at the concert to Instagram. Click through to see more stars at this week's parties.