Could Bret Michaels be returning to "Rock of Love"?

The Poison rocker is single again as Bret's rep confirms he and longtime/sometimes girlfriend Kristi Gibson have called off their engagement.

The two have been dating on and off for about 18 years.

Bret and Kristi memorably got engaged after Michaels popped the question on his VH1 reality show, "Bret Michaels: Life As I Know It," back in 2010. Re-watch the emotional proposal in the video above.

According to Bret's publicist, the two will "remain great friends and are committed to jointly raising" their daughters.