But Zoe - who attended the Beverly Hills Rimowa store opening Tuesday - tells E! News, "I'm here. I'm fine. I feel great, and I'm good."
Dr. Fred Pescatore, author of The Hamptons Diet, estimates the 5-foot-1 Zoe weighs just 80 pounds. A Zoe pal is not surprised, telling UsMagazine.com: "She's obsessed with being skinny. She never eats. If she does, it's fat-free."