Lady Gaga drew an estimated 2.1 million fans to a free concert on Rio de Janeiro's Copacabana Beach on Saturday. The massive crowd, exceeding that of Madonna's previous concert at the same location, enjoyed a performance that included Gaga's hits and was part of her global tour promoting her new album, "Mayhem." Fans dressed in Gaga-themed costumes, creating a vibrant atmosphere. Gaga surprised beachgoers the night before with a surprise rehearsal performance.

Prepared by Emily Rhodes and reviewed by editorial team.