Katy Perry & John Mayer: Inauguration Ball!

Katy Perry and John Mayer pose for a picture in this new photo posted to Instagram from Monday (January 21) at the Inaugural Ball in Washington, DC.

Hitting up a different Inaugural Ball that evening, the Learn.Build.Create Inaugural Celebration at W Washington DC, was pregnant Malin Akerman, who was accompanied by her gal pals Sophia Bush and Kate Walsh.

“The ladies are out to support! @katewalsh @sophiabush #CNN” Malin tweeted.

“Just left the White House. All other parties from here on out will be judged unless they take place at the White House.” Katy wrote on her Twitter after the party.

FYI: Malin is wearing a Roberto Cavalli dress, Stephen Webster jewelry, and a Christian Louboutin clutch. Sophia is wearing Lisa Ho. Katy is wearing Dolce&Gabbana.