Kelis: Knocked Up

Rapper Nas and his wife, singer Kelis, are preparing for the arrival of their first child together, Us Weekly reported Wednesday.

A source says the "Milkshake" singer is in her first trimester and already has a baby bump.

"It's all they are talking about," the source told Us. "She is carrying hip-hop royalty! They are so excited."

Nas has a daughter, Destiny, from a previous relationship. The couple
- both New York natives - got married in January 2005 in Atlanta following a two-year courtship.