Charlie Sheen is going to be a grandfather!

Anger Management actor Charlie Sheen is going to be a grandfather!

According to Mercury News, Sheen’s ex-wife Denise Richards announced the exciting news on Twitter Monday.

“I guess some of you have heard... @charliesheen is going to be a Grampa...yes GRAMPA! his beautiful daughter Cassandra is gonna be a mama..,” she tweeted.

I guess some of you have heard... @charliesheen is going to be a Grampa...yes GRAMPA! his beautiful daughter Cassandra is gonna be a mama..

— Denise Richards (@DENISE_RICHARDS) January 15, 2013

Cassandra is Sheen’s 28-year-old daughter with ex-girlfriend Paula Profit, whom he dated and never married from high school.

The actor confirmed the news during an interview with David Letterman, Radar Online reports. Letterman questioned Sheen saying, “You are going to be, in the next several months? Fill in the blanks… You are going to be a…”

“Grandfather…it’s fabulous,” it’s still “not a title I’m ready to adopt,” Sheen said grinning.

Sheen is also father to 8-year-old Sam and 7-year-old Lola, whose mother is Richards, as well as 3-year-old sons Max and Bob, whose mother is Brooke Mueller. The younger tots will be excited to learn their new title of aunt and uncle.