Happy Birthday Bob and Max!

Brooke Mueller and Charlie Sheen's adorable twin boys celebrated quite the milestone on Wednesday--they turned 3!

Proud mama Mueller, 34, feted her sons' birthday at a Los Angeles park, surrounded by friends and family. On the day's agenda? Pizza, juice boxes, bubble-blowing and moon-bouncing! At the end of the afternoon, Bob and Max had scored some serious loot--including toy trucks and a plastic T-Rex.

For her part, Mueller--who completed an at-home rehabilitation program for substance abuse this winter--was looking happy and healthy as she played on the swings and helped her boys unwrap their gifts.

"Bob and Max are fast turning into little boys," Mueller gushed to Us Weekly about the twins' big day. Lately, she added, "It's all about dinosaurs and firetrucks!"