Lady Gaga tops 20 million followers on Twitter

Pop diva Lady Gaga has become the first person with more than 20 million followers on Twitter, cementing her place as the most-followed on the planet. A 20 millionth "Little Monster," as Lady Gaga calls her fans, signed up to follow her Twitter feed over the weekend. She had 20.12 million followers as of Monday for her @ladygaga account. Teen pop idol Justin Bieber was next with 18.11 million followers of his @justinbieber feed. Rounding out the top five were three other singers: Katy Perry with 15.75 million followers, Shakira with 14.56 million and Rihanna with 14.49 million. US President Barack Obama was in eighth place with 12.84 million followers of his @barackobama account.