Paul McCartney, Leonardo Dicaprio and Robert Downey, JR. gave the Coachella Festival in California a superstar sizzle on Saturday (16Apr11), when they joined the stars in the crowds at the sun-soaked spectacular. They joined the likes of Katy Perry, Lindsay Lohan, Vanessa Hudgens, Danny DeVito, David Hasselhoff and celebrity couples Diane Kruger and Joshua Jackson, Kate Bosworth and Alexander Skarsgard, Whitney Port and Ben Nemtin and Twilight actress Ashley Greene and Jared Followill at the Indio festivities.