About the only thing certain about a Chris Brown concert in Guyana the day after Christmas is that it won't be happening. The concert promoter says Chris backed out of the December 26th engagement in the small country on the northern coast of South America because of protests from local women's groups over his 2009 assault of then-girlfriend Rihanna. But Chris's reps strongly deny the story, saying that the concert was never confirmed. Regardless, it looks like the Rihanna assault is something Chris just can't shake. In Sweden, a November 19th appearance by Chris drew protests from anti-domestic violence groups in the form of a poster showing Rihanna's battered face. And yet, despite all the controversy, Chris and Rihanna have reportedly rekindled their romance (or is it just a friendship?) and even spent Thanksgiving together. Go figure.