Sheen, Mueller Expecting Twins

Charlie Sheen and his wife, Brooke Mueller, are expecting twins, his mother-in-law told People.

"Brooke and Charlie are expecting twins, and they are so excited," Moira Fiore said. "Obviously, I am floating on air."

The soon-to-be grandma said that while the couple isn't absolutely certain of the babies' gender, they "think the twins are boys."

"Brooke has had all day morning sickness but is coming to the end of the first trimester so she hopefully will feel better soon." Fiore added, "It has been rough for her."

Still, "Brooke looks so beautiful," said her mom. "She is just glowing."

The twins, who are due in April, will be the first for Sheen, 42, and mother-to-be Mueller, 31.

Sheen already has two daughters, Sam and Lola, with ex-wife Denise Richards. He also has a 23-year-old daughter, Cassandra, from a previous relationship with Paula Profitt.