MICHELLE OBAMA CAN'T STOP MALIA & SASHA PICS At Beyonce & Jay Z Show

Michelle Obama was powerless to prevent photos of her daughters from going public -- she and 


the girls were captured in selfies at Beyonce and Jay Z's concert last night.
The First Lady chaperoned Malia and Sasha to packed Soldier Field in Chicago -- and a concertgoer lined up some of the fam in the background of her selfie ... and then pushed it out to the world on Instagram.  Michelle called a photo agency earlier this month, and got it to take down shots of Malia walking into a restaurant that's a known paparazzi spot.
The Chi town selfie reveals a huge flaw in the White House's desire to keep the girls out of the public spotlight ... unless they're with the President.
Hard to shut down a stadium full of iPhones.