A sea of people filled Rio de Janeiro’s Copacabana beach on Saturday as pop superstar Lady Gaga played a colossal free concert in the Brazilian city, with more than a million fans expected to attend.

The Little Monster-KatyCat stan wars can stop: these pop divas are friends! On Sunday night, Katy Perry was spotted in the crowd at Lady Gaga's concert in Mexico City, a day after Perry's performance there.

Lady Gaga has performed the biggest concert of her career. The “Abracadrabra” singer held a free concert on Saturday night in Rio de Janeiro, Brazil, on Copacabana Beach, and drew a record-breaking crowd of 2.5 million people.