A third wrote, “Holy s**t she looks like a little girl” with a fourth questioning, “Is that a baby face filter?”
But Abdul had plenty of support from other followers, including Kathy Hilton’s daughter, Paris Hilton.
“Love you,” Paris wrote, while a fan pointed out, “You don’t age!”
There’s no denying Abdul looks fabulous for her age, however she appeared to sport a much different look during her November appearance on the US morning show Today.
Hilton’s star-studded party also included a string of high-profile guests, including her daughters Paris and Nicky Hilton, as well as Kim Kardashian, Kris Jenner and Heidi Klum.
Meanwhile, Abdul’s former American Idol co-star Simon Cowell has made headlines in recent weeks for his ever-changing appearance.
The music mogul, 63, sparked concern from fans after appearing unrecognisable in a Twitter video this month — just months after he said he was done with Botox.
The clip has since been deleted as trolls eviscerated his appearance with many comparing him to a “Madame Tussauds waxwork”.
“Um, can we talk about Simon Cowell for a moment?” said one concerned fan along with photos juxtaposing a still from his recent promo with an earlier photo of the talent show icon, in which he sported a more fully fleshed, natural-looking face.
“Madame Tussauds unveiled their new waxwork of Simon Cowell,” quipped another.