Singer Jennifer Hudson performed Al Green's "Let's Stay Together," which Obama famously sang at a fundraiser last year.
"Just danced to 'Let's Stay Together with the love of my life," the first lady tweeted from her office's @FLOTUS account after the dance.
Just danced to "Let's Stay Together" with the love of my life and the President of the United States. I’m so proud of Barack. –mo— FLOTUS (@FLOTUS) January 22, 2013