They may have already opened for Cher Lloyd, Demi Lovato and Austin Mahone, but this just may have been the most exciting show the Fifth Harmony ladies have ever performed. The girl group sang at the White House Monday (April 6) to celebrate five years of Michelle Obama's Let's Move! initiative.

The girls were introduced by President Obama himself. "This is the fifth anniversary of the First Lady's Let's Move initiative," he said. "And to help us celebrate we've got the outstanding young group, Fifth Harmony, here to help us sing 'Happy Birthday.' Everybody ready to sing 'Happy Birthday?'"

The ladies took the stage, all five of them wearing head-to-toe white, to sing a gorgeous rendition of "Happy Birthday" to Let's Move! True to their name, the song was arranged in five-part harmony.

The girls presented the Obamas with a birthday cake before launching into the song. They also remarked about what an honor it is the be performing at the White House, something so few artists get to do, and acknowledged how great the Let's Move! initiative is.

"Thank you so much to the President and First Lady for having us. It is such an honor and so incredibly cool to be singing at the White House," they said. "We're so honored to be here to help sing Ms. Obama's initiative a happy birthday. We think it's really cool that she helps people all over the nation want to be active and want to be healthy. It's really awesome."

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