All social media was banned from the party, the newspaper said.
"The president and Usher had a dance-off to 'Gangnam Style' along with Janelle Monae. The president was a good dancer, but Usher threw down some amazing Michael Jackson-style moves," the Post quoted an unidentified guest as saying.
"They played 'Single Ladies,' and all the women were dancing, led by [first lady] Michelle. Later, everyone lined up and did the electric slide, and the president led a party line around the room. Most people did the conga with him. The only people who weren't dancing were Bill Clinton [without Hillary], Timothy Geithner and John Kerry.
"Pick any party you've ever been to; this was 1,000 times better," the source said.