Brooke Mueller held a party on Sunday for Bob and Max, who turn 2 on Monday, at the Bel Air home of Kathy and Rick Hilton.
A source said that it was a "casual and child friendly celebration."
Charlie was not invited to the party and wasn't expected to attend.
Even though the boys was with their friends and they seemed "to be having a good time," it's still sad that they couldn't spend their special day with their father.
They're so impressionable at this age so you would think Charlie would try harder to get his act together so that he can spend time with his children.
Hopefully he will learn his lesson so that he can be there for their next birthday.
[Image via WENN.]