Ali Lohan, the 17-year-old sister of Hollywood actress Lindsay Lohan, has dramatically changed her look after she signed a contract with famous agency models.

After several years of experience in model industry, Ali confirmed a contract with NEXT model management last month.

She looks much slimmer, her lips fuller and her jawline seems more remarkable. However, her trademark eyebrows remained the same. What happened to her?

There are rumors about her change. All are wondering that if she got a plastic surgery done or whether it is a part of a regular aging process?

Her transformation has shocked everyone, even her father.

It's scary to see my daughter looking like this, said her father Michael Lohan. This industry has a way of having a harmful affect on one's health and well being. To see what Lindsay has gone through is one thing, I certainly hope Ali isn't going through the same thing, he added.

“Aliana has never had any type of plastic surgery in her life, nor has she ever considered it,” said Ali's representative.

Ali is growing up; that’s all,” she added.