Mean Girls lovers still have about a month to wait before they get to watch their favorite movie as a movie musical.But in the meantime, to hold everyone over until the film is released, two of the most exciting and talented women in music announced a new single to accompany the upcoming feature film.Megan Thee Stallion and Reneé Rapp’s joint single, “Not My Fault,” is slated to arrive everywhere on Friday, Dec. 15.