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OTRC: Beyonce & Jay-Z, Katy Perry & John Mayer attend 2013 Presidential Inauguration (Photos, Videos)

Two celebrity power couples attended President Barack Obama's Presidential Inauguration ceremony in Washington, D.C. on Monday, January 21 -- Beyonce and husband Jay-Z and Katy Perry and boyfriend John Mayer.

Beyonce, who has voiced her support for the U.S. leader and his wife, First Lady Michelle Obama, many times in the past, sang the national anthem at Obama's second inauguration ceremony (watch video). The R&B singer sang at his first, which took place months after he was first elected, in January 2009.

At Monday's Presidential Inauguration, Perry was seen on live TV sitting beside Mayer and taking photos of him with her cell phone. She later posted on Twitter a photo of what appeared to be a silver pin that resembles a large, decorative hat that singer Aretha Franklin wore at Obama's 2009 inauguration ceremony.

"Big inauguration, tiny Aretha hat," Perry said.

Perry performed at several pro-Obama events before the 2012 presidential election. On Saturday, January 19, she rocked out in a dazzling red, white and blue outfit at the Kids' Inaugural Concert (see photo), an event that honors America's military families. Michelle Obama introduced the "Teenage Dream" singer, calling her "fabulous."

Pop star Kelly Clarkson performed "My Country, Tis Of Thee" at Monday's Presidential Inauguration (watch video), while James Taylor sang "America The Beautiful" while playing an acoustic guitar (watch video.)

Clarkson arrived at the ceremony with her fiance, Brandon Blackstock. Other stars who attended the event include "Desperate Housewives" alum Eva Longoria and ABC's "Scandal" star Kerry Washington, who are also longtime supporters of the president.

Check out photos of Beyonce and Jay-Z, Katy Perry and John Mayer, Kelly Clarkson and Brandon Blackstock and Eva Longoria at the 2013 Presidential Inauguration.

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