As of last count this morning, the 18-year-old superstar had a whopping 33,333,554 Beliebers (and counting) to Gaga's still whopping but now slightly less so 33,328,937 Little Monsters.
Neither star has commented on the change as of yet. However, it was only last week that Bieber reached 33 million followers, when his Beliebers used the hashtag #33MillionBeliebers to celebrate.
Earlier in January, Bieber was the victim of a Twitter hoax, in which the hashtag #cutforbieber started trending, showing people inflicting self-harm, supposedly in reaction to photos that seemed to show Bieber smoking marijuana.
Last year, Lady Gaga used her followers to help her track down a fan who she wanted to employ on her creative team, The Haus of Gaga.
Lady Gaga is still ahead of Justin Bieber in Facebook "likes". Gaga has 54.9 million fans on Facebook compared to Bieber's 50.66 million.
You can watch their twitter-follower battle at Twittercounter.com.
Katy Perry is in third for most Twitter followers, with about 31.5 million.
On Instagram, Bieber's at 6.1 million followers, significantly than Gaga who has around 724,000. Kim Kardashian still holds the top spot on Instagram, though, with 6.3 million followers.
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