Jay-Z, Beyonce

Jeffrey Mayer/WireImage.com

H to the...Happy Birthday!

Jay-Z and Beyoncé hit Skylight West this week to celebrate their friend's birthday, and they weren't the only bold-faced names in the house.

Diddy, Russell Simmons and Gayle King all turned out to fete a certain hip-hop heavyweight at an Egypt-themed party.

So who was blowing out the candles?

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It was Mary J. Blige, who turned 40 on Tuesday (aka "1/11/11") in NYC.

Her hubby, Martin Kendu Isaacs, organized the surprise soiree, which began with a dinner party at 9 p.m. and went all the way until 3 in the morning.

Mary offered toasts to Diddy, for pushing her so hard, as well as Beyoncé, whom she called "an inspiration".

Another special surprise was when Anita Baker took the stage to croon "Caught Up in the Rapture."

"Mary was moved to tears and started singing along with Baker," a source tells us.

Hey, it's her party and she'll cry if she wants to!

PHOTOS: Party Pics New York

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