Splash News Online; Sipa
May 05, 2011 03:40 PM

While Levi Johnston is working on a new book, his former fiancée Bristol Palin appears to be working on herself.

The mom of son Tripp, 2, stepped out at the Candie’s Foundation 2011 benefit gala on Tuesday in New York looking thinner – and sporting what appears to be a more angular jaw line and pronounced chin.

Is her new look the result of cosmetic surgery? Palin, 20, did not respond immediately to PEOPLE’s request for comment.

RELATED: Levi Johnston Writing Palin Family Tell-All

But board certified plastic surgeon Dr. Brian Glatt thinks that may be the case. “She seems to have had liposuction of her entire neck with a focus under her chin,” Glatt, who hasn’t worked with Palin, says in a press release, “which has produced a much more defined jaw line and lower facial area.”

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