JUSTIN BIEBER has surpassed LADY GAGA to become the most-followed person on Twitter...but it's still a ridiculously tight race.

As of last night, both of them had more than 33.3 MILLION followers. But Justin was ahead by about 18,000.

And it sounds like his lead is only going to increase. According to Twittercounter.com, Justin adds an average of 40,055 followers per day, while Gaga only gets 30,495.