Possible Clues:

• "Smack That" singer
• 'Right Now (Na Na Na)' rapper
• Senegalese-American rapper nominated for four Grammys in 2008
• "Right Now (Na Na Na)" rapper
• Senegalese-American rapper
• "I Wanna Love You" singer/rapper
• 'Konvicted' hip-hop artist
• "Smack That" rapper
• "Konvicted" rapper/singer
• 'Smack That' rapper