Los Angeles:Actor Brad Pitt is reportedly desperate about getting supermodel-actress Cara Delevingne to star in one of his upcoming movies. He is said to have already offered her the lead role in "World War Z 2". "Brad thinks Cara's talents haven't been explored properly and he wants to take her under his wing," radaronline.com quoted a source as saying. “He's hoping she might sign an ongoing deal with his company," the source said. Delevingne is said to have declined the "World War Z" sequel offer as she "can't do it because of schedule conflicts". However, the source said that "Brad won't give up" on scoring Delevingne as his "next big thing". "He's opened his contacts book to her and given her numbers of the best acting teachers in Hollywood. He really thinks she's got what it takes to win an Oscar one day," the source added.