Kelis Rogers filed for divorce Thursday in Los Angeles. She's expecting the couple's first child in July.
Documents show the couple was married in July 2003 and separated in April. Rogers is seeking to have her hip-hop husband pay her attorney's fees and spousal support.
She cited "irreconcilable differences" as the reason for the split.
Nas' real name is Nasir (NAH-SEER) Jones. He is considered one of rap's best artists and received a Grammy nomination for his latest untitled album. Kelis may be best known for her hit single "Milkshake."
His publicist did not respond to an e-mail message seeking comment.
Copyright 2009 The Associated Press.