Following a brief trip to Vegas, Spears steps out in L.A. to shop. Plus: Kate & Liv, Courteney & David and more

A CUT ABOVE

Joel Madden plays gentleman escort to girlfriend Nicole Richie, picking her up from a Beverly Hills salon on Tuesday. The rocker recently told PEOPLE that his relationship with Richie is going well: "I am really happy and everything's really good for me right now."