David Mueller, who worked as a radio host in Denver, Colorado, attended a concert by the pop star with his girlfriend, and they were invited backstage where they got a photograph with the Bad Blood hitmaker.

Mueller claims he was later kicked out of the venue by the singer's security staff after they accused him of "grabbing her butt" when the snap was taken, and the incident led to him being fired from his job, according to TMZ.com.

Editors at the website report Mueller is now suing Swift for lost wages.

Representatives for the singer had not issued a comment as WENN went to press.