Beyonce Knowles beamed as she departed from Heathrow earlier today before popping up in a more casual outfit at JFK. She's been traveling around the UK for her tour, but she has a short break now before her next performance at Madison Square Garden on June 21. She ended her London run with a big surprise last night as George Michael joined her on stage for an "If I Were a Boy" duet. The crowd cheered wildly as the two pop icons belted out her song — check out the video below.

To see the video of Beyonce and George's duet just