First Lady Michelle Obama will be feted at the White House Saturday night when President Obama throws her a dance party for turning the big 5-0. And the birthday wishes for the First Lady poured in on social media Friday, from her push-up buddy Ellen Generes to the president - the kid president that is.

Happy 50th Birthday, @FLOTUS!! You are an inspiration for so many and one of the most beautiful people I've ever met… Inside and out.

- Justin Timberlake (@jtimberlake) January 17, 2014

HAPPY BIRTHDAY @FLOTUS @MichelleObama - May the joy, hope, confidence and courage you inspire in others be returned to you all year long! XO - kerry washington (@kerrywashington) January 17, 2014

Happy birthday, @MichelleObama! You may be 50, but your arms are 22. - Ellen DeGeneres (@TheEllenShow) January 17, 2014

Happy 50th to @FLOTUS Michelle Obama. Thanks for the great work you do with @LetsMove to help our kids get healthy. - Bill Clinton (@billclinton) January 17, 2014

Welcome to the Fabulous and Fifty Club @MichelleObama! Wishing you a Happy Birthday. #DancingAtWhiteHouse

- Robin Roberts (@RobinRoberts) January 17, 2014

Fab at 50! Happy Birthday, @FLOTUS! -Jill pic.twitter.com/KvjbFEUBKn

- Dr. Jill Biden (@DrBiden) January 17, 2014

Happy Birthday @MichelleObama, a First Lady who puts country & kids first. Here's to at least 50 more healthy, fulfilling years. Cheers!

- rachael ray (@rachaelray) January 17, 2014

I understand it's @MichelleObama's birthday! Happy 29th Michelle!

- William Shatner (@WilliamShatner) January 17, 2014

Happy birthday @FLOTUS! Thanks for helping to make the next generation of children healthier every day! pic.twitter.com/Ual7f6M3hu

- Sesame Street (@sesamestreet) January 17, 2014

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