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.