Michelle Obama

Michelle Obama Turns 50

Tweets picture of AARP card

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Michelle Obama is celebrating her 50th birthday Friday.

The first lady is spending the day out of sight, with no public appearances after back-to-back White House events this week.

But she tweeted a picture of herself holding up her AARP card. She tweeted, quote, "Excited to join Barack" in the 50-plus club today. "check out my @AARP card!"

President Barack Obama turned 50 in 2011.