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Bret Michaels, girlfriend Kristi Gibson call off engagement

Bret Michaels and Kristi Gibson arrive at Muhammad Ali's Celebrity Fight Night XVII on March 19, 2011, in Phoenix. Getty

(CBS/AP) NEW YORK - Bret Michaels and longtime girlfriend Kristi Gibson have called off their engagement.

Michaels' publicist, Joanna Mignano, said in a statement Monday that the couple had separated.

Pictures: Celebrity splits

Michaels and Gibson have dated on and off for about 18 years and have two daughters, Raine Elizabeth and Jorja Bleu. They got engaged in 2010.

The statement says Michaels and Gibson will "remain great friends and are committed to jointly raising" their daughters.

Michaels was the vocalist for the band Poison. He also appeared on the VH1 reality shows "Rock of Love" and "Bret Michaels: Life as I Know It."

Michaels was treated in 2010 for a brain hemorrhage. Last year, he underwent a procedure to close a hole in his heart.