The 'Anger Management' star hosted a bash in November last year with a predominantly-female guest list but his now-fiancée Brett Rossi warned it would be the last one he threw.
A guest of the event at Charlie's Mulholland Estate in Beverly Hills said: "It was just a great party. Being a 'Charlie Sheen party, there was - like always - more girls than guys. Everyone was getting along very well, except for one person."
The 48-year-old actor's porn star girlfriend was reportedly furious with the guest list at the shindig and made it clear to her partner that the night was to be his final hurrah before settling down with her for good.
The source added: "She was not impressed. All of the guests had their cell phones confiscated and everyone signed non-disclosure agreements. The party had sky writers, fantastic food and Charlie was clearly having fun.
"Little did he realise it would be the last party he would be hosting like that for a very, very long time!
"As long as Brett is in the picture, there will be no more parties with Charlie's harem of women."
Charlie proposed to his girlfriend - who is half his age at 24 years old - while on a Valentine's Day (14.02.14) trip to Hawaii but the wedding is currently on hold as she is yet to finalise her divorce from her first husband, Jonathan Ross.