Ali sparked plastic surgery rumors after emerging with her more angular face and fuller lips. But the Lohan camp vehemently denied that the teen had gone under the knife. So if it wasn't plastic surgery, then what could have changed Ali's look so drastically? Drastic weight loss, plastic surgeon Dr. Robert Rey told E! Online, explaining that "cheeks protrude more and [her] overall appearance is somewhat gaunt." But Lindsay blasted anyone who picked on Ali's weight. "I love how haters pick on my sister yet every runway model is just as thin!" she tweeted. "My sister is gorgeous, and I'm so proud of her and her career!!!!"