So that's how she keeps so slim! Beyonce

By DAILY MAIL REPORTER Surprise visit: Beyonce poses with students at a school in Harlem, New York, today where she took part in Michelle Obama's Let's Move Initiative to fight childhood obesity RnB superstar Beyonce got her grove on today as she joined a group of New York pupils for a dancing session.The 29-year-old singer, who has shed weight in recent months, surprised students in Harlem as