Actress Mary Elizabeth Winstead was so star-struck by her LIVE FREE OR DIE HARD co-star Bruce Willis, she was too nervous to speak to him on set. The 23-year-old - who plays John MCClane's daughter Lucy in the fourth installment of the film franchise - admits meeting the veteran actor was such a surreal experience, she struggled to overcome her shyness. She says, "Our first big argument scene was on my first day on set. My first day and I had to yell at Bruce Willis. "I was so intimidated - a feeling that, because of the size of the franchise and the stars, stayed with me throughout. I rarely opened my mouth outside of takes all movie."