White House dance party celebrates Michelle Obama's 50th birthday

(CNN) – An invitation to a White House dance party Saturday night to celebrate Michelle Obama's 50th birthday is the hottest ticket in town. Think less inaugural ball, and more "Saturday Night Fever." While the First Lady may be sending tweets about

WASHINGTON — Michelle Obama is celebrating her 50th birthday Friday by 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.

SLIDESHOW – Michelle Obama's 40th birthday is the perfect time to remember how far she has come and how much she has accomplished as the nation's first African-American first lady

Even though she absolutely doesn't look it, Michelle Obama turned the big 5-0 on Jan. 17. Celebrate her birthday here with all of her best looks.

SLIDESHOW – Michelle Obama's 40th birthday is the perfect time to remember how far she has come and how much she has accomplished as the nation's first African-American first lady