The America's Got Talent judge, 59, was spotted at the popular Malibu chili cook off event—after RadarOnline.com's report that top doctors believe he's had plastic surgery on his face.
And the medical experts, who haven't treated Simon, believe he's ruined his look with "poorly placed fillers" and Botox.
The hubbub started when Simon looked dramatically different when he appeared on a recent red carpet during the AGT live shows.
The famed music producer attributed his altered appearance to a "20 pound weight loss after going vegan," but several of the nation's leading plastic surgeons told Radar exclusively that dieting has nothing to do with his freaky new face!
America's Holistic Plastic surgeon Dr. Anthony Youn has not treated Cowell, but told Radar, "I think he's had some bad Botox. If Botox is injected too far out on the side of the forehead, it can cause the forehead and eyebrows to droop."
Aesthetic Injector Kristina Kitsos, RN, MBA hasn't treated Cowell, but said after looking at before and after photos of him, "Simon Cowell has had too much Botox in the lateral forehead, causing the sides of his eyebrows to droop down like that. I strongly advise my clients to do a little and add to it if necessary, therefore they look rested and natural. This is definitely a case where less would have been more."
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Simon caused a stir by showing up at the Malibu event for Labor Day weekend.
The longtime TV judge stuck close to his only child, little Eric. The famous father has said "him getting bullied is what I dread most."
Simon and Lauren got together when she was still married to her husband, causing a scandal in 2013. Lauren, who gave birth to their boy Eric in February 2014, is divorced but she and Simon still haven't wed.
"Children are under so much stress – with homework, pressure. I really don't want that for him," Simon has said of his adorable son.
Simon appeared to chat with friends and total strangers and their kids at the cook off.
Don't Mean To Be Rude
But Simon looks like he's had work done on his face, in the opinion of top docs who haven't treated him but spoke to Radar.
Is Simon getting Botox? At one point, his facial expression at the cook off looked extreme!
TV has been very good to Simon, but this summer, Howard Stern blasted him as a "sleazebag" and "liar."
Simon has been a hands-on dad, and regularly takes Eric to work with him on AGT and Britain's Got Talent.
Taking A Ride
Simon and his son enjoyed all the Malibu event had to offer, including food and kid-friendly amusements.
That he lost a lot of weight, but doctors who haven't treated him claim he's also tried to look younger with Botox.