Robin Thicke step aside - Pharrell Williams has found a new Blurred Lines partner in Alicia Keys.

After Thicke ditched his producer pal for a raunchy rendition of the song at the MTV Video Music Awards with Miley Cyrus in New York in August (13), Williams hit the stage at the 10th annual Keep a Child Alive Black Ball benefit in the Big Apple on Thursday night (07Nov13) with the charity gig's leading lady.

Event founder Keys thrilled guests at the black-tie benefit when she teamed up with Pharrell for the big number and kept the fun going by running through the hitmaker's Daft Punk collaboration, Get Lucky, with him too.

She made this year's AIDS research benefit a family affair by posing for pictures with husband Swizz Beatz and their three-year-old son Egypt on the red carpet and then her man served as the house DJ for the Hammerstein Ballroom bash, which also featured performances from Carole King and Laura Mvula.