Possible Clues:

• "Smack That" singer
• 'Right Now (Na Na Na)' rapper
• 'Konvicted' hip-hop artist
• Senegalese-American rapper nominated for four Grammys in 2008
• Senegalese-American rapper
• "Smack That" rapper
• 'Angel' rapper
• One-named singer with the 2006 hit 'Smack That'
• 'Smack That' rapper
• "Right Now (Na Na Na)" rapper