Possible Clues:

• Contemporary R&B diva
• R&B singer of "Oh" and "Promise"
• R&B singer with the 2004 #1 hit 'Goodies'
• "Body Party" vocalist
• R&B singer with 'Like a Surgeon' (no relation to the Weird Al song)
• One-named singer with the #1 hit 'Goodies'
• ''Oh'' R&B artist
• Four-Grammy winner of 2006
• R&B artist with the 2005 hits "Oh" and "And I"
• One-named singer with the 2005 hit 'Oh'