TODAY   |  January 16, 2014

White House prepares to celebrate first lady’s 50th

Many celebrities are expected to attend first lady Michelle Obama’s 50th birthday celebration at the White House, with a top adviser saying a lot of dancing is expected. NBC’s Kristen Welker reports.

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>> kristen, what's on tap?

>> reporter: for days they've been gearing up for a big day at the white house . guests were told to wear comfortable shoes and to be prepared to move around a lot. an indication there will be no shortage of dancing here. the buzz about the first lady's birthday party , possible performances by adele or beyonce, who has dazzled for the first family before. at last

>> reporter: but for now saturday's plans are top secret . what is known, president obama is playing the role of planner in chief after the first lady threw a big 50th bash for him three years ago.

>> you do get the sense his competitive juices are flowing.

>> reporter: just back from an extended stay at oprah's house in hawaii, a gift from the president, the first lady seems to be taking up the big 5 -0 in stride, opening up to "people" magazine.

>> i've interviewed four first ladies and i've never seen one so candid and relaxed about such a personal thing. she is dancing into her 50s.

>> she said turning 50 brings her a certain sense of confidence. her message to women, be heathy. i have never missed a mammogram.

>> she's incredibly frank.

>> the plans for her big milestone are under wraps.

>> i asked the president if he could whisper if my ears. he said it's top secret , not even the nsa knows that.

>> reporter: turning 50 and in addition to wearing comfortable shoes, guests were reportedly also told to eat first.

>> i'm liking the dancing part.