The 21-year-old songstress rather offered him a free pass for her upcoming show, reported Contactmusic.
"Dear Matt Peterson, I don't think I'll be able to make it to prom but why don't you come to my AZ show and hang with me? Don't forget a corsage," she posted on twitter.
The post was a reply of a video where Peterson asked Cyrus to the prom when her Bangerz tour hits the state of Phoenix.
"I have been a fan of yours from the beginning. You've changed my life and I want to repay you by giving you the best night of your life," said the fan in the video.