Lady Gaga becomes the first person to reach 15 million followers on Twitter

The pop singer is the top Twitter user with over 15 million Twitter followers. Lady Gaga became the first user of the social network site to reach the milestone on October 27, according to Media Bistro's All Twitter blog. Gaga also set a personal best by gaining a million Twitter followers in just 28 days. Previously it took her around 31 days during July and August to reach that goal.

The All Twitter blog estimates that Gaga could pass 16 million followers in a month and might reach 20 million by March or April 2012.

The singer hit the 15 million follower mark while visiting India to attend the unveiling of the country's first Formula 1 Grand Prix race.

"I am finally here + what a dream come true. Performing at Formula 1 in INDIA, and my first day here I reached #15millionmonsters," she wrote on Thursday.

The closest person to Lady Gaga's record is currently teen pop star Justin Bieber, who has 13.8 million followers on Twitter. Katy Perry is in third with 11.4 million.

Gaga once held the record for most Facebook likes, but was surpassed by Eminem in February. The rapper still outpaces Lady Gaga on Facebook with his 48.3 million likes to Lady Gaga's 44 million.

Recently, the 25-year-old singer was challenged by animal rights group PETA to wear to pose in a dress made out of lettuce leaves while she is in India.

"If she agrees, we'll make her a dress entirely of lettuce and held together by pins and threads," Sachin Bangera of PETA India told the Associated Press. "It will be a full length gown, and we'll make sure it looks sexy. Someone will be on hand to spray the lettuce with water so that it doesn't wilt."

The singer famously wore a dress made out of raw meat to the 2010 MTV Video Music Awards to protest the "Don't Ask, Don't tell" policy, which banned openly gay U.S. service members. The policy has since been lifted.

Lady Gaga, who is known for her controversial costumes, had said on "The Ellen DeGeneres Show" she did not mean to cause disrespect to vegans or vegetarians by wearing her meat dress to the MTV awards ceremony.

A lettuce leaf outfit may be easier for locals in India to stomach. Vegetarian diets are common in the country, where cows are considered sacred by the country's Hindus, who make up a majority of the population. The slaughter of cattle is banned in several states.