Music
The co-headlined tour has already been full of surprise guests.
Charli XCX and Troye Sivan have some tricks up their sleeves.
The pop princessappeared onstagefor her verse, clad in a pink fur coat.
Released in 2009, TiK ToK was the lead single on Keshas debut studio album,Animal.
During the Oct. 15 performance, she added even more electro to the electro-pop anthem by incorporating heavy autotune.
Fans flocked to social media to share their excitement for the crossover moment.
TheSweattour has been full of surprise guest stars.
And in LA, Sivan surprised the audience with pop starTate McRaefor a performance of their joint song You.