Denise Richards and ex-husband Charlie Sheen threw a birthday party at her Hidden Hills, Calif., home for Sheen's other ex-wife, Brooke Mueller.

Richards threw a pool party for Mueller's 35th birthday and invited family and friends.

A source says, "Brooke and Denise have spent some time together lately and there is a budding camaraderie there." 

Plus, the kids have a good relationship with each other and the girls "are like real big sisters to them."

Now, given the history of Charlie Sheen and his exes, this jsut makes it awkward.  I know when there are kids involved, it's different.

Could you throw a party with your ex for your other ex?

-AJ

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