At the time of writing, Bieber has 33,319,471 to Gaga's 33,318,977, which means a lot of retweets.
On January 15 the 'Marry The Night' hitmaker congratulated Bieber on closing the gap — "So proud of @justinbieber and all the Beliebers! I'm only happy to see your fans growing in size, you all deserve it!" — but she's yet to tweet her thoughts now that he's overtaken her.
We're sure the more 'passionate' among the 'Little Monsters' are incredibly pleased about it all.