updated 11/29/2011 AT 2:00 PM ET
•originally published 11/30/2011 AT 10:45 AM ET
In September, a photo of Aliana Lohan with a brand-new look sparked rampant speculation the 17-year-old model had gone under the knife.
Not so, says Lindsay Lohan’s younger sister, who adamantly denies she underwent any nip-tucks.
“I was cracking up. Because, like, when would I do that? I’m 17 years old,” Ali tells New York Post’s Page Six Magazine in its December issue. “That’s not legal! I would need my mother’s signature, and do you think my mom would ever sign off on that? No!”
Calling plastic surgery “not the right thing to do,” the aspiring model shoots down rumors about her.
“It’s stupid,” she says. “I don’t listen to it. It’s absolutely not true.” (At the time, her rep refuted plastic surgery claims, telling PEOPLE that Ali was just undergoing a “growth spurt.”)
“I just say no,” she said. “I’m lucky enough that I had my sister to learn from. I ve seen people do it to her, so I’ve learned to be like, ‘That s stupid, no.’ That s why me and Lindsay are also so close, because we re able to talk about those things together.”