Clinton unknowingly photobombed Kelly Clarkson, who was singing "My Country, 'Tis of Thee" shortly before Obama took the oath of office, in a photo that was captured on televised broadcasts of the event and later circulated around Twitter.
"What an honor to be a part of history!" she tweeted. "Obama's presence was powerful and his words unforgettable. It's a proud day for America!"
Though Clarkson didn't address the Clinton photo, she posted another presidential snapshot on her Twitter account - only this one was intentional.
"Maybe the coolest photo I've ever been in ....ever :)" she captioned a photograph of herself shaking Obama's hand.
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