Following Charlie Sheen’s Twitter rant about his ex-wife and the mother of two of his children, Denise Richards, on Father’s Day, she’s now getting into it with his agent.

They seemed to have been getting along so well lately, but that all ended on Sunday when Sheen called her, among many other insults, the “worst mom alive.”

Sheen’s press agent, Jeff Ballard, told People Richards said the Father’s Day trip to Mexico was too last minute for her to bring their daughters Sam, 11, and Lola, 10, and that she thought "Charlie didn't know it was Father's Day until last Sunday.”

Ballard claimed this trip, that Sheen went on anyway, "had been planned for almost three weeks.”

"Charlie invited Denise and their two girls, but for whatever reason Denise chose not to go,” Ballard continued. “For her to claim he only realized it was Father's Day on Sunday just isn't true."

Although Richards declined to comment, she tweeted, “Jeff I think you had way too much to drink @jeffballardpr & lost your memory dude. Zip It. @people.”

Richards also killed Sheen with kindness on the day of the rant, tweeting, “@charliesheen have a great trip in Mexico," she wrote on Twitter. "Kids were disappointed u weren't here for it- Hey we'll celebrate when u r back!”

He spent time with Brooke Mueller and their twins, Bob and Max, 6, in Mexico for Father's Day instead.

image via Dara Kushner/INFphoto.com