Possible Clues:

• Singer with numerically named albums
• Pop superstar from Tottenham
• Winner of 15 Grammys (2009-2017)
• Sister of Fred Astaire
• “Water Under the Bridge” singer
• "21" and "19" singer
• 'Hello' singer, 2015
• "25" album maker
• One-named singer of "Skyfall"
• British singing sensation