Possible Clues:

• 'Goodies' singer
• "Goodies" singer
• '1, 2 Step' singer
• "Level Up" singer
• R&B singer of 'Oh' and 'Promise'
• One-named R&B singer with the hit '1, 2 Step'
• R&B artist with the 2004 hit '1, 2 Step'
• One-named R&B artist
• One-named singer dubbed the "First Lady of Crunk & B"
• Mononymous R&B singer with the triple-platinum album 'Goodies'