The hard part about going star-incognito in Hollywood is that sometimes you're not recognized by your fellow celebrity pals. Such was the case with a baseball hat-wearing Leonardo DiCaprio, who almost missed out on meeting his friends Penelope Cruz and Javier Bardem at Hollywood's famed Kate Mantilini's on Thursday. "Leo was all hat and shoulders in a booth on a business lunch, and Penelope almost walked right past his table," says a star-struck fellow diner. "Leo just happened to look up and see the couple pass. He bolted up to say hello just before they walked right past his table."