What was the largest Britney Spears crowd?

The largest crowd Britney Spears performed for was at the 2001 Super Bowl halftime show, where she entertained an estimated audience of over 100 million viewers worldwide. Additionally, during her "Dream Within a Dream Tour" in 2002, she performed to a crowd of approximately 20,000 fans at the Mandalay Bay Events Center in Las Vegas. These events showcased her immense popularity and ability to draw large audiences.