Beyonce (and Michelle Obama) at Revel in Atlantic City

During the second show of her four night run at the brand new Revel resort and casino in Atlantic City on Saturday night, Beyonce Knowles sang her feminist club banger "Run The World (Girls)" and many other other crowd pleasers besides - yes, single ladies, she did "Single Ladies (Put A Ring On It)" - in a highly energetic show in which both breathless booty-shaking workouts and respect-demanding heartsick ballads were delivered with almost frighteningly impassioned intensity.

But on this night, the better half of the most formidable couple in pop music wasn't even the most
powerful woman in the sold-out 5050 capacity room. Instead, that would have been Michelle Obama, the First Lady of the United States. A few minutes before Beyonce hit the stage, FLOTUS, whose presence at Revel had been rumored but unconfirmed since mid-afternoon, walked in with daughters Sasha and Malia in tow, waving to the crowd from a box to the right of the stage, in a sleeveless green dress.

Beyonce's two hour set included tributes to Donna Summer and Whitney Houston, and a cover of Lauryn Hill's "Ex-Factor." For her first shows since giving birth to her much celebrated daughter Blue Ivy Carter in January, the impressively svelte singer told the crowd she had lost 60 pounds and planned, after the show, to "get chocolate wasted."

New Jersey Gov. Christie and his family were also in the house for the show on the grand opening weekend for the $2.4 billion Revel, on which such high hopes for Atlantic City's economic future are pinned. After the show, the noted Springsteen, and now apparently Beyonce, fan tweeted his unequival conclusion that everything about the evening was "great": "Great show by Beyonce. Great energy, great dancing & she was in great voice. Great night for Atlantic City."

A full review of the show will be up online Sunday, and in Monday's Inquirer.

Previously: Garbage in Atlantic City Follow In The Mix on Twitter here