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Beyoncé and Stevie Wonder played a top-secret 50th birthday party for Michelle Obama on Saturday night at the White House.

Spies said that more than 300 guests — including Paul McCartney, Jennifer Hudson, Bill and Hillary Clinton and Facebook’s Sheryl Sandberg — were required to check their phones before entering the bash so there could be no photos or tweeting.

Spies told Page Six that guests arrived beginning at 8:30 p.m. through the East Wing, then enjoyed cocktails and hors d’oeuvres in the State Dining Room as well at the White House’s Green, Blue and Red Rooms.

“This was the party of the year in DC,” explained a guest. “The first family had a mix of friends, politicians, athletes, entertainers and business execs.”

Singer Ledisi, a Michelle fave, kicked off the evening’s entertainment followed by a half-hour set from Beyoncé, during which the diva sang “Single Ladies (Put a Ring on It)” and “Irreplaceable.” John Legend then appeared to croon “Happy Birthday” to Michelle and presented a cake while President Obama toasted to his wife.

A wild dance party then kicked off with DJ Cassidy spinning tunes. And Wonder jumped onstage with the DJ for a medley of songs including “Signed, Sealed, Delivered (I’m Yours).”

The party raged till 2 a.m., spies said, for guests including Janelle Monáe, Samuel L. Jackson, Angela Bassett, Ashley Judd and Gayle King.

Also in the crowd were VP Joe Biden, Attorney General Eric Holder, Smokey Robinson, former pro athletes Billie Jean King, Alonzo Mourning, Magic Johnson, Emmitt Smith and Ahmad Rashad as well as Google’s Eric Schmidt, Disney honcho Bob Iger, 32 Advisors’ Robert Wolf, American Express CEO Kenneth Chenault, Blackstone COO Tony James, Carlyle Group co-founder David Rubenstein, Haim Saban, Donna Karan and the Rev. Al Sharpton.

Though signs at the party said “no social media,” Hudson managed to tweet afterward, “We had such a good time with the 1st family in dc tonight!”