Spotify has 2.5m paying subscribers

"This week is Thanksgiving in the US. And we’ve got our own reasons to give thanks too.
Fanfare! Drum roll! Yes, we’re excited to announce that we’ve now welcomed 2.5 million paying subscribers to the service.
So we’d like to say a big thank you to all our subscribers, new and old. Keep spreading the good news about Spotify!
Of course, we’ll continue to focus on providing you with the best music service possible. We’ve got some exciting developments in the works, which we’ll share with you very soon."

Source:  Blog post by Spotify, 23rd November 2011

Earlier - 2m subscribers announced in September

Earlier - 1.5m subscribers announced in August