Spotify CEO Daniel Ek revealed the new figure in a taped interview with CNBC that is set to air in the U.S. Wednesday, a company spokesperson tells Mashable.
Ek will also speak at Facebook's f8 developer conference Thursday, where he's expected to reveal details of the company's rumored music partnership with Facebook.
Spotify announced that it had more than 1.6 million paying subscribers during its U.S. launch in July. The much-buzzed about music startup hit the 1 million paying subscriber milestone in March, meaning it has doubled its paying customer base in just over six months.
By comparison, Rhapsody hit 800,000 subscribers in July and Sony's unlimited music product counts 750,000 people as paying customers. MOG and Rdio are also both said to be partnering with Facebook on the music initiative to be unveiled Thursday; they've yet to disclose subscriber numbers.