Popsugar Fitness Celebrity Fitness Celebrities Hiking in Los Angeles All the Stars Used Hollywood as Their Gym This Week! February 7, 2014 by Michele Foley View On One Page Photo 4 of 6 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 4 Ashlee Simpson Based on the sweat factor, it looks like Ashlee got a great workout in this week! Previous Next Start Slideshow Celebrity Fitness