Britney Spears appears to make dig at Iggy Azalea after 'Pretty Girls' remark
The two music stars teamed up for the 2015 track, which features Azalea as a guest.
Spears took to Twitter overnight to seemingly respond by citing Azalea's recently cancelled tour.
The pop singer said: "Can’t wait to get back to Vegas. So thankful I have shows for the rest of the year to look forward to...#YouWantAPieceOfMe."
The two music stars initially promoted the track with a performance at this year's Billboard Music Awards.
Watch the 'Pretty Girls' video below:
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