Possible Clues:

• 'Miss Independent' singer
• One-named singer/producer with 'So Sick'
• One-named R&B singer with 'Give Me Everything'
• "Miss Independent" R&B singer
• Singer involved with two Top 10 songs named "Let Me Love You"
• R&B artist with the hits 'So Sick' and 'Because of You'
• Singer with the 2006 #1 hit 'So Sick'
• "So Sick" R&B singer
• 'So Sick' R&B singer
• R&B singer with the platinum single 'Miss Independent'