• Taylor Swift and Miranda Lambert

Taylor Swift and Miranda Lambert (Photo : Instagram )

Taylor Swift recently surprised her fans when she had Miranda Lambert on stage during her "1989 World Tour" concert in Grensboro, North Carolina. The two then performed the country singer's hit "Little Red Wagon." New rumors, however, have started to circulate online claiming that Swift and Lambert are not in good terms because of Blake Shelton.

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According to OK! magazine, via Hollywood Life, the singers could not stand each other. Insiders claim that Swift has long hated Lambert but her feelings only intensified when the latter broke it off with Shelton. It was said that Swift has always been closer to "The Voice" coach and always thought that he deserved better.

If the two had bad blood between them, why did they agree to perform together? The source said that it was a PR stunt to help Lambert get back on her feet following the divorce. It was said that the country singer had been receiving multiple backlash over cheating rumors. In order to "repair her image," Lambert had to do several things, which she was uncomfortable doing, even if that means sharing a stage with Swift.

Another singer, who has always been rumored to be "frenemies" with Swift is Katy Perry. Although unlike Lambert, the "Roar" singer is more than capable of selling songs on her own.

Perry has topped Forbes' World's Highest-Paid Women In Music 2015. The singer reportedly earned $135 million in the past year. Most of it came from the "Prismatic" tour as well as her endorsement deals with Claire's Coty and Covergirl.