Washington, June 18 : Stephanie Pratt has laid the blame of her struggle with bulimia on her skinny co-stars in The Hills.

The 23-year-old revealed she began gorging 5,000 calories a day followed by intense purging under the agony of working with thin colleagues.

The size 0-2 Pratt recalled moments when she was once "horrified" after watching a scene with co-star Lauren Conrad.

"I remember saying, ''I can''t believe how huge I look walking over to Lauren," Fox News quoted her as telling Us magazine.

The actress, who graced the cover of Us magazine in a bikini, said the producers never pressurised her to drop some pounds but she found it "embarrassing working with skinny girls." (ANI)