Double the Estevez, Double the Fun!

Charlie Sheen and Brooke Mueller are taking that whole "Two and a Half Men" thing to heart.

Our sources say Brooke is double the preggers -- as in she's expecting twins. Your move, Denise.

The little tykes would be the first for Brooke; Charlie has two young kids with ex Denise Richards and a 22-year-old daughter named Cassandra he had out of wedlock with girlfriend Paula Profit.