That same day, Demi Lovato shared a video on Snapchat of Norman and his Walking Dead cast mates singing her “ Happy Birthday.” Watch. Listen to Demi Lovato singing Happy Birthday to a fan. The singer shared the clip of Andrew Lincoln and Norman Reedus singing ' Happy Birthday ' to her on her Snapchat. Lovato, who was. Nick Joins Troy's Army In New Fear The Walking Dead Preview. Visit the App Store to see all our apps:. Demi Lovato Talks Life Post-Heartbreak, Touring With Nick Jonas: Homecoming Jul 7 Fire Fire Fire Fire Fire. Marvel's The Inhumans Pilot Nov 8 Register - Forgot Password.