It sounds like Florence had a lot to celebrate yesterday and not only was it her birthday but as soon as the track leaked, Twitter went a bit mental with her name trending all over the place.
Tweeting her followers, Flo said: "Thank-you so much for all your kind words for 'sweet nothing'..you are a lovely bunch..x " [sic]
The track itself will be part of Calvin's new album '18 months,' due out in October, but in the mean time it sounds like preparations for the music video are coming along royally.
"Arrive at mysterious working mans club for start of 'sweet nothing' vid, glad the queen is here to welcome me..," Flo said, tweeting a photo of herself posing with a patriotic snap of Queen Liz.
We think it's going to be big, but have a little listen and see what you think..
Calvin is all set to play the iTunes Festival at London's Roundhouse on September 15 - We can't help wondering if he might be inviting along a Florence shaped special guest?
But what do you think? Comments below please!