Listen! Britney Spears and Iggy Azalea's track

Britney Spears and Iggy Azalea have unveiled their new track Pretty Girls online, check it out here.

Fancy star Azalea took to Twitter to say that she can't stop listening to their single, which is "so classically Britney".

Spears also tweeted her thanks to her fans for their "amazing feedback" on the track, and promised "some more surprises coming soon".

The pop duo will perform Pretty Girls at the Billboard Music Awards on May 17, check it out below.

#PrettyGirls is OUT on @iTunesMusic!! Hope you all love it! #BuyPrettyGirlsOniTunes http://t.co/Crh0TPymTh pic.twitter.com/TnwGFyT3VK

— Britney Spears (@britneyspears) May 4, 2015

Thank you all for the amazing feedback on #PrettyGirls!! Going to bed now with a smile on my face 😊 Have some more surprises coming soon!

— Britney Spears (@britneyspears) May 4, 2015

Hi just wanted to come online and tell you all how extremely excited iam for Pretty Girls to be released & that we are going to perform it 2

— IGGY AZALEA (@IGGYAZALEA) April 14, 2015

Thank you all for the amazing feedback on #PrettyGirls!! Going to bed now with a smile on my face 😊 Have some more surprises coming soon!

— Britney Spears (@britneyspears) May 4, 2015

To be honest im just over here acting like a total fan girl for britneys vocals on this song. cant. stop. listening. so classically britney.

— IGGY AZALEA (@IGGYAZALEA) May 4, 2015