According to People.com, POISON singer Bret Michaels and his longtime girlfriend Kristi Gibson have called off their engagement."Although the couple have separated, they remain great friends and are committed to jointly raising their two daughters," a spokesperson for Bret tells the magazine. Michaels, 49, and Gibson, 41, have two children together, Raine Elizabeth, 12, and Jorja Bleu, 7. Michaels proposed to Gibson on the December 2, 2010, finale of his VH1 show "Bret Michaels: Life As I Know It". After getting down on one knee, Michaels said, "I want you to know that I love you and you've been unbelievably a big part of my life and we have two beautiful girls together. I know we love and respect each other and I hope we can find that inner love that we can have forever. I want you to be my wife." He then jokingly added, 'Please say yes or the rejection will kill me right now."