Steve Granitz / WireImage 1 / 11
Steve Granitz / WireImage 1 / 11

Alicia Keys was treated to a star-studded surprise birthday bash on Sunday featuring performances from Nas and Stevie Wonder.

RELATED: Grammy afterparties

Keys turned 33 on Saturday and her husband Swizz Beatz ensured she celebrated in style by throwing a secret party for his wife at a mansion in Los Angeles after Sunday's Grammy Awards.

Around 75 friends and family, including Russell Simmons and Busta Rhymes, watched rapper Nas hit the stage to perform with Sean "Diddy" Combs, before Keys joined him for a rendition of his Lauryn Hill duet "If I Ruled the World."

RELATED: Grammy's buzzworthy moments

Wonder then played his classic hit "My Cherie Amour," according to New York Post gossip column Page Six.

In a post on Twitter to mark Keys' milestone, Swizz Beatz wrote, "HBD to a true goddess. Love you baby."

The singer had already celebrated at the Grammys earlier in the evening after winning the Best R&B Album prize for "Girl On Fire."

RELATED: Grammy fashion hits and misses