As the temperature rises, the divas get weirder.
They're flipping up their middle fingers. They're acting out of whack. They're donning geometric lingerie from the '90s.
Below, check out what's happening with the most intriguing female singing stars of the moment -- music's top five mysterious mavens.
Oh, Lady Gaga. First, she said she liked those hermaphrodite rumors. Then she told Larry King that she maybe/possibly had lupus. Then she reportedly had the backstage area of London's O2 arena searched for ghosts. Now she's flipping off baseball fans.