Oprah Winfrey, Michelle Obama

Kevin Mazur/WireImage for Time Inc.

Michelle Obama turned the big 5-0 today, and the first lady spared no time proudly showing off her AARP card.

And why shouldn't she? She's married to the president and just joined him in the 50+ club.

Mr. and Mrs. Obama are set to celebrate tomorrow night at the White House. Officials are keeping a tight lid on the deets, but word is Beyoncé will be the one to serenade the First Lady. And with the FLOTUS' celebrity pals including familiar faces like Oprah Winfrey, Taylor Swift, BeyoncéGeorge Clooney, and others...who knows who else will show up.

While we're not sure which celebs will take part in the festivities, we do know many of them took to Twitter today to wish her the best on her birthday!

And even the President joined in on the fun to celebrate his wife of 21 years, posting the photo below with the caption, "Happy 50th, Mrs. Obama."

PHOTOS: Check out more of the First Lady's celeb connections!

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