(AGI) Washington, March 17 - There was absolutely no need toprove that Michelle Obama is the coolest First Lady to haveever lived in the White House, but now a video posted onYouTube has also confirmed her talent as a dancer. In order topromote the fifth year of her 'Let's Move' campaign, the51-year old presidential spouse, a convinced advocate ofphysical fitness and healthy nutrition, showed off her perfectphysical form with a live performance on the Ellen DeGeneres TVshow. During the very popular show, Michelle promoted her latest"Gimme 5" initiative, asking American top-notch celebritieslike Beyonce', but also ordinary U.S. citizens, to reveal thehealthy lifestyles they lead by giving five practical examples.Michelle Obama announced that during the White House's Eastercelebrations, with the traditional Easter Egg Roll, she willpresent the "Gimme5Dance", which was conceived in order to keeppeople fit. She then challenged DeGeneres to a dance-off, whichEllen happily accepted, as she joked: "Listen, I'm in bettershape than you!". "Don't even try it," the First Lady replied.The pair then performed an energetic routine in perfect sync tothe sounds of Mark Ronson and Bruno Mars' hit "Uptown Funk",which became an immediate cult video on YouTube. .