Here's What Charlie Sheen Missed by Skipping Kids' Weekend Birthdays

With dad not welcomed, three of his children celebrate their birthdays in L.A. with their mothers, Denise Richards and Brooke Mueller

Charlie Sheen missed three very important parties this weekend: daughter Sam's 7th birthday and his twin sons Max and Bob's 2nd celebration.

Sheen wasn't invited to either Sam's shebang, hosted by ex-wife Denise Richards Sunday at an L.A. gymnastics studio or Brooke Mueller "very fun" bash at pal Kathy Hilton's home complete with a bounce castle.

While Charlie was MIA, some other boldface types were present.

Among them: Kathy's daughter Nicky, her boyfriend, David Katzenberg, and Real Housewife Adrienne Maloof.

"I go to kids parties strictly for the food! :D," Nicky tweeted.

All told there were about 50 guests for the twins' party, with nary a goddess in sight.

Hostess Kathy pulled double party duty yesterday: she celebrated her own 52nd birthday on Sunday.

"The party was for the boys, but everyone celebrated Kathy by presenting her with a large cake in the shape of a heart because she has such a big heart," one of the attendees tells us.

Kathy's evening was capped with a family dinner at Madeo, where she was joined by daughters Nicky and Paris, sons Barron and Conrad and hubby Rick.

And despite the fact that he's next door neighbors with Paris, this was yet another bash yesterday Charlie obviously didn't make the list for.

Can we say he's losing yet?