Kelly Clarkson Kelly Clarkson

Kelly Clarkson was on mushrooms during her performance at President Obama's Inauguration Monday. The legal kind, that is.

Clarkson  and friends dined on stuffed mushrooms, spaghetti, chicken parmesan, lasagna and other hearty Italian dishes at Washington, D.C.'s Buca di Beppo the night before her blistering live rendition of "My Country, 'Tis of Thee" at Monday's ceremony, TMZ reports.

Bill Clinton photobombs Kelly Clarkson at Inauguration

The American Idol winner took a picture with the restaurant's staff after she and her group ran up a $230 bill. They capped off their meal with a colossal brownie sundae, according to the report.

Seems like carbs are the secret to hitting those high notes!

Watch Clarkson's performance below: