The chart-topping singer hits the stage for a good cause in Las Vegas. Plus: Usher, Katie Holmes, Lauren Conrad and more

BAT MAN

With David Blaine dangling in the wings, Donald Trump announces the illusionist's newest stunt Thursday during a press event in New York City. Starting Sept. 24, Blaine will wear electro-magnetic boots and cling upside-down to a six-story highwire above Central Park for 60 hours – with no net below.