Reyna Roberts is a self-described "really shy and awkward, and just really nerdy" -- which is somewhat hard to believe coming from such a talkative, bubbly and fashionable person, but talk with her a little while and she's sure to drop a Star Wars reference or two. It's not too surprising, then, to learn the inspiration behind Roberts' driving, sultry song "67 (Winchester)": Dean Winchester, one of the protagonists in the CW series Supernatural . He's portrayed by actor Jensen Ackles and drives a 1967 Chevrolet Impala; his car, in fact, is what sparked the whole idea for the song. Below, Roberts shares the story behind "67 (Winchester)" in her own words.