Us Weekly reports that after a whirlwind Inauguration Day for the president and first lady Michelle ObamaMichelle ObamaMichelle Obama holds fitness 'bootcamps' for friends Obama marks Father’s Day: ‘I'm most proud to be Sasha and Malia's dad’ Obamas invited to be honorary football coach at University of Michigan 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 KerryBudowsky: Dems madder than hell Tillerson: 'My view didn’t change' on Paris climate agreement CORRECTED: Three members of Mueller's team have donated to Democrats 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. HolderOvernight Tech: Uber CEO resigns | Trump's Iowa tech trip | Dems push Sessions to block AT&T-Time Warner deal | Lawmakers warned on threat to election systems | Uber CEO Travis Kalanick resigns Holder mulling 2020 bid 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!"