Rapper Nas aka Nasir Jones & Kelis Rogers at Island Def Jam Tag Records launch party during the 2008 BET awards week at Kress. Hollywood, California - 23.06.08

Kelis has filed papers via top divorce lawyer Laura Wasser, citing "irreconcilable differences" and a spokesperson for the Milkshake hitmaker tells Vibe.com, "I can confirm that she has filed for divorce. We request the media to respect her privacy during this very difficult time."

Kelis is expecting the now-estranged couple's son at the end of the summer (09).

Nas has a teenage daughter from a previous relationship.

The couple met at an MTV Video Music Awards afterparty in 2002 and they wed in Atlanta, Georgia in July, 2003.

Source: WENN