The marriage between Queensbridge, NY rapper Nas and R&B songbird Kelis is officially over.   Vibe magazine reports that divorce papers were filed around 3:45 p.m. today (April 30) by attorney Laura Wasser on behalf of Kelis.   A representative denied intitial reports that verbal abuse and infidelity were the reasons behind the filing.   "We request the media to respect her privacy during this very difficult time," a representative for Kelis said in a statement. ...(read more)