Charlie Sheen and Brooke Mueller threw a birthday party for their twins Bob and Max on Saturday. The pair - who have been locked in a bitter custody war about their children - put their differences aside to plan the bash, which took place the day after the boys' 5th birthday. Charlie's porn star fiancée Brett Rossi was also present at the party, gossip website TMZ reports. The celebrations come after Brooke - who originally lost custody of the twins when she was placed on involuntary psychiatric hold at the UCLA Medical Center last year - moved back into the Mulholland Estates house the 48-year-old actor bought her. She's now taking care of her sons. A source said: ''Brooke has been living at the mansion in Mulholland Estates since before Christmas... Brooke does have a nanny and a sober living companion also with her in the house. There just wasn't enough room at the condominium she had been living at for her staff.''