U.S. Supreme Court Justice Ruth Bader Ginsburg made her first public appearance Monday night since she underwent cancer surgery in December.

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Ginsburg attended a production of "Notorious RBG in Song," a musical celebration of her life created and performed by her daughter-in-law, soprano Patrice Michaels, at the National Museum of Women in the Arts in Washington, according to The Washington Post.

Ginsburg sat in the back and did not speak and her presence was not announced, the Post reported.

But some knew she was there. The production was performed for high school students by the National Constitution Center and the center’s president and CEO, Jeffrey Rosen, tweeted, “Thrilled that Justice Ginsburg attended the first concert performance of #Notorious RBG in Song.”

The 85-year-old associate justice underwent surgery Dec. 21 to remove cancerous nodules from her lung. Doctors said after the surgery that there was “no evidence of any remaining diseases.”

It can take up to eight weeks to recover from that kind of surgery.

It's unclear whether Ginsburg will attend President Donald Trump's State of the Union address Tuesday before a joint session of Congress, but if last year is any indication, she won't be there.

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8/26/17 - Atlanta, GA - Georgia leaders, including Gov. Nathan Deal, Sandra Deal, members of the King family, and Rep. Calvin Smyre,  were on hand for unveiling of the first statue of Martin Luther King Jr. on Monday at the statehouse grounds, more than three years after Gov. Nathan Deal first announced the project.  During the hour-long ceremony leading to the unveiling of the statue of Martin Luther King Jr. at the state Capitol on Monday, many speakers, including Gov. Nathan Deal, spoke of King's biography. The statue was unveiled on the anniversary of King's famed "I Have Dream" speech. BOB ANDRES  /BANDRES@AJC.COM

Credit: Bob Andres