Katy Perry Channels Aretha Franklin at Inauguration

Katy Perry. Inset: Aretha Franklin

Jason Reed/Rueters/Landov

01/21/2013 AT 1:05 PM ET

Katy Perry was feeling festive – and possibly a little nostalgic – at the Inauguration of President Barack Obama on Monday.

The “Teenage Dream” singer, 28, who was joined by beau John Mayer, 35, in Washington, D.C., for the festivities, sported a fun little hat with a miniature version of the bow Aretha Franklin wore to the same event in 2009.

“I had it made,” Perry told PEOPLE. “I thought it would be fun to do a shout-out back to four years ago.”

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