Charlie Sheen is going to be a grandpa.

That popping sound you're hearing is the nearest ocean, beginning to boil.

The actor's oldest daughter, Cassandra, 28, is expecting her first child. Sheen's ex-wife Denise Richards announced the news on Twitter, writing, "I guess some of you have heard ... @charliesheen is going to be a Grampa ... yes GRAMPA!" Adding, "his beautiful daughter Cassandra is gonna be a mama."

Nothing like sending little Timmy over to Grandpa Charlie's house, where he can go swimming, have lunch, and learn words like "crack pipe" and "escort."

Cassandra's mother is the actor's high school girlfriend Paula Profit. The two never married. Sheen was married to Richards from 2002 to 2006 and they have two children together, Sam, 8, and Lola, 7. The actor also has 3-year-old twin sons, Bob and Max, with Brooke Mueller, who lets Richards watch her kids sometimes because she goes to rehab a lot.

How encouraging to hear there's another generation on the way.

Contact Tony Hicks at thicks@bayareanewsgroup.com or on Facebook at www.facebook.com/BayAreaNewsGroup.TonyHicks.