Today is Lady Gaga’s 25th birthday, and what better way to celebrate than being the first person to reach 9 million followers on Twitter? Her fans have responded by trending the #bornthisday hashtag for the past 24 hours.

Good times. Unfortunately, these happy days probably aren’t going to last forever, as Gaga’s place as Twitter’s most-popular user is under threat from Canadian pop star (and all-around social media irritant) Justin Bieber, who is now just half a million fans behind.

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