At 10:12 p.m. last night, President Barack Obama and his wife Michelle returned to the White House after a long day of inaugural festivities. Twenty minutes later, aides to the president relieved the on-duty pool reporter, who was sent home as the president would no longer be leaving the White House or appearing publicly.

But was there a party going on there, a private bash to celebrate Obama's Second Inaugural? It seems like it. San Antonio mayor Julián Castro tweeted this picture of himself and his twin brother Joaquin:

There were no public events at the White House late last night, so it appears the Castro brothers stopped by for some sort of private celebration.

Julián was a keynote speaker at the Democratic National Convention last year, and his brother Joaquin is a freshman congressman from Texas.

And besides, who can blame the Obamas for wanting to go home? It was a long day, and the Inaugural ball the Obamas attended, as magnificent as it appeared on TV, sounds lackluster. "They knocked on doors for him and helped him win re-election, but when Obama supporters put on their tuxedos and ball gowns to celebrate the start of his second term in office, they feasted on pretzels, peanuts and Cheez-its," Reuters reports.

The celebration continues tonight, with one more ball. "In the evening, the President, the Vice President, the First Lady and Dr. Biden will attend the Staff Inaugural Ball at the Walter E. Washington Convention Center in Washington, DC. There will be in-town travel pool coverage of the Staff Inaugural Ball," the White House schedule reads.

Lady Gaga is rumored to be performing tonight at the White House Staff Inaugural Ball.

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