The Global Citizen Festival was truly a star-studded occasion. Everybody and their momma was there, ok maybe not everybody but Ariana Grande, Leo DiCaprio, Gwyneth Paltrow, Chris Martin, and Beyonce were all on hand to stand up for healthcare, education, poverty, and host of other initiatives. While Joe Biden was on hand to personally introduce President Barack Obama, who made an appearance via a video, it was Michelle Obama that stole the show as she made a surprise appearance at the festival. Check out the video below to check out the highlights.