Charlie Sheen's Twins Celebrate Birthday - Without Their Dad

Charlie Sheen's "winning" ways didn't score him an invite to his sons' birthday party.
The troubled actor's boys, Max and Bob who turn 2 on Monday, celebrated at a party Sunday with their mom, Brooke Mueller, and about 50 guests.
"The party is a casual and child friendly celebration," a source tells PEOPLE of the bash at Kathy and Rick

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