McKenna Grace is already in Scooby-Doo mode! The 19-year-old Scream 7 actress was in attendance at the Celebrity Friends For F1 Miami Grand Prix Qualifying Race on Saturday (May 2) hosted by Raising Cane's owner Todd Graves at Miami International Autodrome in Miami, Fla. McKenna Grace shows off red hair after Scooby-Doo casting McKenna showed off her brand new red hair, which she's sporting after being cast as Daphne Blake in the upcoming Scooby-Doo series on Netflix.