From Oprah turns 50, having a few million friends over. This Saturday, high-profile guests like Halle Berry, Julia Roberts and Maria Shriver will descend on the San Ysidro Ranch in Santa Barbara, Calif., where Oprah has rented rooms to accommodate invited guests. She’s also booked all the rooms at the Four Seasons Resort Santa Barbara, forcing “Lord of the Rings” stars Elijah Wood, Liv Tyler and Viggo Mortensen – who will be in town to promote “The Return of the King” at the Santa Barbara International Film Festival – to relocate to the Bacara Resort in Goleta, Calif.