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Denise Richards was snapped visiting ex-husband Charlie Sheen numerous times when he received in-home rehab treatment last month, but it seems like the once civil relationship between the former spouses has taken a turn for the worse.

Richards reportedly angered Sheen by forbidding him to pose for a picture with their daughters Sam and Lola, and a source tells Us Weekly, "When Denise refused [to let him take a photo with the girls], he threatened her with physical harm."

Richards was apparently so frightened by Sheen's erratic behavior she banned him from Sam's 7th birthday last week, and it was also reported that she sided with Sheen's other ex-wife Brooke Mueller when she received similar threats. "Denise is constantly trying to shield [Sam and Lola] from their dad's problems," says another source. "But it was becoming harder."