Actress Denise Richards promotes the new book "The Real Girl...

Actress Denise Richards promotes the new book "The Real Girl Next Door" at Barnes & Noble TriBeCa in Manhattan. (July 26, 2011) Credit: Getty Images

Actress Denise Richards, ex-wife of Charlie Sheen, reportedly has broken up with her on-again, off-again boyfriend, Bon Jovi guitarist Richie Sambora.

Sambora, a scheduled presenter at the CMT Awards last week in Nashville, abruptly left Richards to walk the red carpet alone following a heated argument. This led to their breakup shortly afterward, said the gossip site Celebuzz.com.

E! Online said Tuesday that the couple's screaming match could be heard outside their room at the Hermitage Hotel. E! speculated that one source of contention was Richards' friendly relationship with Sheen, 46, the father of their daughters, Sam, 8, and Lola, 7.

Richards, 41 walked the red carpet alone after Sambora, 52, canceled his appearance. E! said the rocker was on his way back to Los Angeles before the award show started.

The "Wild Things" actress and star of the 2008-09 E! reality show "Denise Richards: It's Complicated" reunited with Sambora in November after breaking up with him in 2007. They split again in January, then briefly started up once more before this most recent breakup.

Richards, who did a guest spot on "30 Rock" this spring, stars in the Tyler Perry film "Madea's Witness Protection," due out June 29. She also guests on Sheen's upcoming FX comedy, "Anger Management," playing the new business partner of Sheen's onscreen ex (Shawnee Smith).

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