Charlie Sheen wants to have children with Brett Rossi.

The 'Anger Management' actor - who already has grown-up daughter Cassandra with former girlfriend Paula Profitt, daughters Sam, nine, and Lola, eight, with second wife Denise Richards and twin sons Bob and Max, four, with former spouse Brooke Mueller - is ''open'' to having kids with his 24-year-old fiancee, but says they don't plan to do so just yet.

He added to website TMZ: ''I'm having way too much fun with her right now. So much fun it should be illegal.''

The 48-year-old actor also says Brett has spent time with his sons and they adore her as much as she loves them.

Though it has been reported the former 'Two and a Half Men' actor - who has an estimated fortune of $125 million - will have a pre-nuptial agreement with Brett, he insists he doesn't want a ''formal'' arrangement because ''pre-nups poison marriages.''

Asked what their pre-nup will say, he replied: ''You keep your s**t and I'll keep mine.''

Charlie married for the first time in 1995, to Donna Peele, but they split a year later.