"Drinking more water is an easy choice that everyone can make. Look who's drinking up at the @WhiteHouse: #DrinkH2O," read the coy tweet.
The photo shows the Drink Up glass on the historic Resolute Desk as the President meets with Director of Speechwriting Cody Keenan in the Oval Office, on Sept. 25, 2013, according to the photo caption from Chief White House Photographer Pete Souza.
The tweet was posted by an aide; Mrs. Obama signs personal tweets "-mo."
A sign promoting Drink Up was posted in the White House's Navy Mess the day after Mrs. Obama unveiled her campaign during a visit to Watertown, Wisconsin, on Sept. 13th.
Drinking more water is an easy choice that everyone can make. Look who's drinking up at the @WhiteHouse: #DrinkH2O pic.twitter.com/SqryW8h3yO
— FLOTUS (@FLOTUS) September 26, 2013