Us Weekly reports that after a whirlwind Inauguration Day for the president and first lady Michelle ObamaMichelle ObamaDems, GOP bicker via official Twitter accounts Bill Maher to Dems: 'When they go low, you go lower' Lily Collins shares letter from Michelle Obama MORE, the couple hosted a soiree at the White House into the wee hours of the morning.

A source tells the magazine of the celeb-filled shindig, “The party went on until 2 a.m.!”

Among the guests who reportedly mixed and mingled with the first family at the Monday night gathering were former President Clinton; former Secretaries of State Colin Powell and Madeleine Albright; Sen. John KerryJohn KerryEllison comments on Obama criticized as 'a stupid thing to say' 'Can you hear me now?' Trump team voices credible threat of force Obama to attend Pittsburgh Steelers owner's funeral MORE (D-Mass.); Alicia Keys and her husband, Swizz Beatz; Usher; Kelly Clarkson and her fiancé, Brandon Blackstock; Jennifer Hudson; Eva Longoria; Kerry Washington; “CBS This Morning” anchor Gayle King; Brad Paisley; Ashley Judd; Attorney General Eric HolderEric H. HolderDem rep: Jim Crow's 'nieces and nephews' are in the White House Obama to attend Pittsburgh Steelers owner's funeral Ex-Uber employee who spurred sexual harassment probe to lead new publication MORE; Katy Perry and rumored on-again boyfriend John Mayer; and John Legend and his fiancée Chrissy Teigen.

According to Us Weekly’s source, “They all stayed until the end ... Obama was dancing with everyone and let his guard down!"