Sheen and Richards in 2004
MIRANDA SHEN/GLOBE
The child, due in June, will be the second for the couple. Their daughter Sam Sheen was born March 9 in Los Angeles.
"They are incredibly thrilled and I couldn't think of a better Christmas present for the both of them and for little Sam," Richards's agent, Chuck James, tells PEOPLE.
Sheen also has a daughter, Cassandra, 20, from a previous relationship.
Richards, 33, and Sheen, 39, married in June 2002. They first met while shooting the movie Good Advice in 2000. But it wasn't until Richards guest starred on Sheen's former sitcom Spin City in fall of 2001 that a romance began to blossom.
On their first date, on Oct. 4, 2001, they hung out in Sheen's condo to watch San Francisco Giant Barry Bonds tie the major league home run record. "I made the first move kissing him," she told PEOPLE. "He was Mr. Polite, such a gentleman."
By their second date, Richards recalled "I knew that this is the one, but I wouldn't tell him that. I didn't want to scare him away by saying, 'You're my future husband!' and have him run for the hills."
