ORLANDO – Justin Bieber, taking estrogen pills to avoid puberty, now has breasts!

At age 13, the mysterious Bat Boy’s hormones are apparently kicking in — he’s developed a crush on Senator John McCain’s daughter Meghan!

Ms. McCain’s security team say the half-human, half-bat mutant has made repeated attempts to see the young beauty — and whined “like a sad dog” when he was shooed away!