Beyonce & Jay-Z: 'Forever Young' Duet at Yankees Stadium!

Beyonce Knowles and Jay-Z arrive at the 40/40 Club after his show with Eminem at Yankees Stadium on Monday (September 13) in New York.

The 29-year-old Single Ladies singer made a surprise appearance at the concert to perform Jay‘s hit song “Forever Young” in Mr. Hudson‘s place.

On Sunday night, Bey walked in Tom Ford‘s show during Fashion Week alongside other beauties Julianne Moore and Chanel Iman. The show was so exclusive that only one photographer was let in and no photos were released!

FYI: Beyonce is wearing the Ruthie Davis Angelina pump, available at Endless.com.