At 78, David Hockney just keeps on working. We visited him in his studio in the Hollywood Hills and found the walls hung with row after row of portraits -- all part of a project called "82 Portraits And 1 Still Life" that will be a book and an exhibition this summer at the Royal Academy in London. He's also working on another book, A History of Pictures, and he has surveys of his work opening in the next year in London and Melbourne. And, a film about his life, called simply "Hockney," directed by Randall Wright, opens this weekend in LA. We hear about his many passions, including LA, art and art history, and smoking.