Who says “Hot Girl Summer” can’t last through the fall? Megan Thee Stallion, 26, fans were treated to a surprise appearance by Miley Cyrus, 28, as the Plastic Hearts singer ran out onstage during the rapper’s set at the Austin City Limits music festival on Friday October 1. A fan shot video from backstage showed the “Wrecking Ball” singer sneaking up from backstage to surprise Megan in the middle of her set.