Lady Gaga first to reach 10 million Twitter followers

NEW YORK POST -- Pop star Lady Gaga was the reigning queen of Twitter on Monday after becoming the first person to amass 10 million followers.

The milestone made her the most-followed person on Twitter, ahead of Canadian teen pop singer Justin Bieber and President Barack Obama.

"10MillionMonsters! I'm speechless, we did it!" Lady Gaga wrote after reaching the milestone just before 12:00am Sunday. "It's an illness how I love you. Leaving London smiling."

Lady Gaga became the first person to reach 9 million Twitter followers on March 28 -- also her 25th birthday. In August 2010, she overtook Britney Spears as the most-followed user by amassing 5.7 million followers on the site.