Lindsay Lohan is just one of many stars who have sparked curiosity when it comes to a new wave of “undetectable” plastic surgery among celebrities.

The 38-year-old actress — who stars in Netflix’s new holiday movie, “Our Little Secret” — recently turned heads after appearing in her new film and had social media users questioning: what has she done to look so fresh and youthful? 

“I need to know absolutely everything that occurred between 2018 to 2024 to have this crazy of a transformation,” an esthetician said in a viral TikTok in November. “I’m in the industry and I’m at a loss for words.”

Dr. Kristy Hamilton, MD, FACS, of the American Society of Plastic Surgeons, told Fox News Digital that this “undetectable” look represents something much bigger than “just a trend.”

Lindsay Lohan in January 2024 (left), versus Lohan in December 2024. (Getty Images)

“The ‘undetectable’ look is not just a trend — it represents a significant cultural shift in aesthetics as well as progress in and refinement of our surgical techniques as plastic surgeons,” she said. “I would argue that overfilled lips and frozen faces have never been trendy — they’re the unwanted side effects of patients seeking youth that perhaps have been overtreated — or, simple stated, would have benefited from a surgical intervention instead.”

Hamilton says she often tells patients that faces “are not like fashion statements.”

“We can’t easily undo aesthetic surgery like we can easily change a dress silhouette, so we are seeking classic, timeless beauty at all times,” she said. “Patients now prioritize treatments that allow them to look refreshed and youthful without revealing that they have had work done. This evolution is driven by advancements in technology, techniques and a deeper understanding of facial anatomy, which enable results that blend seamlessly with the patient’s natural features.”