The cease fire between Charlie Sheen and Denise Richards is over.

The exes, who endured a famously nasty divorce in 2006, have recently been photographed together enjoying family outings with their daughters, Sam, 3, and Lola, 2, and even Sheen’s fiancée Brooke Mueller.

However, according to the New York Post’s Page Six, those days are done.

A friend close to Sheen, 41, tells Page Six that, while the Two and a Half Men star is trying to haul Richards into L.A. Family Court to get looser visitation rights that won't require him to be supervised, Richards is opposed to the plan.

"She's doing everything she can to keep his visits supervised by her nanny, because her nanny spies for her," says the source.

Another Sheen pal denies reports that Richards recently went shopping with Mueller, 29.

"Denise set it up,” says the friend. “Brooke did get a call from Denise saying, 'It's an emergency, come meet me now.' When Brooke met her, there were four paparazzi waiting to take their picture. After the pictures were done, Denise told Brooke, 'It's been taken care of.' "

Richards, 36, denies the sources’ claims. "This is disgusting," she told Page Six. "He is doing this now because he's not happy with me and the custody arrangement."

She shot down rumors that she’s withholding the couple’s children from their father.

"My mom is going through chemotherapy and I asked Charlie if my mom could see the kids before she got really sick. That's a valid request. He doesn't stick to the schedule he has with the kids - that's not my fault.”

She continued: "I did ask both Charlie and Brooke to lunch to see the kids - he hadn't seen them in two weeks - but only Brooke took me up on it. The paparazzi were already following me, as they do every day, and took a picture."