Scottish singer KT Tunstall was left redfaced after mistaking actor Nicholas Hoult for child actor Freddie Highmore on live radio. The star appeared alongside 17-year-old Hoult - who leaped to fame in 2002 British comedy About a Boy - on BBC Radio 5, but mistook him for 15-year-old Highmore. She told him, "I love you in Charlie and the Chocolate Factory."