As he revs up for a possible presidential bid, Donald Trump has been invited to lead the pack at the Indianapolis 500 on May 29. The real-estate mogul and "Celebrity Apprentice" star has been asked to drive the Chevrolet Camaro SS pace car by Indianapolis Motor Speedway president and CEO Jeff Belskus. A source told us, "It is an incredible honor." Trump plans to decide by June whether to join the field of GOP contenders competing in 2012. We can't imagine The Donald being in a race that he won't try to win.