Talk about a turbulent relationship. Feisty singer Pink and motocross star Carey Hart have been on-again and off-again since the pair first hooked up in 2002. Wed since 2006 -- when she proposed to him! -- and separated in 2008, they're currently on-again in a major way, but not heading into parenthood territory just yet. A note the singer dropped on Twitter in April triggered a flood of rumors that the pair was expecting.