Possible Clues:

• R&B singer with the hits 'So Sick' and 'Mad'
• "Time of Our Lives" singer
• R&B singer with the 2012 hit 'Let Me Love You'
• R&B singer with the hits 'So Sick' and 'Miss Independent'
• Singer with the 2012 hit 'Let Me Love You'
• R&B singer with the 2006 #1 hit 'So Sick'
• "Self Explanatory" R&B artist
• R&B singer with the 2006 hit 'So Sick'
• Singer with the 2006 #1 hit “So Sick”
• Singer who judges 'World of Dance'