Robert Irwin's New 'Uncle Life' Photo With Niece Grace Leaves Fans Asking If She Needs an 'Aunty'

Recently, Robert Irwin posted a serious thirst trap photo of himself with his niece, Grace —and the picture left fans asking if she needs an "aunty."

On Friday, Sept. 6, the animal conservationist took to Instagram with a snapshot of himself wearing a black T-shirt and black pants while smiling and holding 3-year-old Grace. The preschooler rocked a pair of footie pajamas with an elephant print as she made a silly face while wearing glasses.

"Uncle life for me! ☺️," the 20-year-old son of the late Steve Irwin captioned his update.

Robert's sister (and Grace's mom), Bindi Irwin , 26, commented, "Thank you for being the best uncle and brother. We love you!"

Their mom, Terri Irwin , wrote, "Grace loves you so much!"

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Meanwhile, many Instagram users couldn't help but notice Robert's large and seriously toned arm muscles. One speculated, "Robert must lift every day - look at his biceps 💪 👀."

"Welcome to the gunshow!🔥😍🔥," a different Instagram user quipped, as others wrote comments like "hello bicep" and "Robert Buffwin."

Another fan who liked what they saw wondered, "Does she need an aunty?" while someone else echoed, "I could be a great aunty. Just sayin’ 🙂‍↔️."

Plenty of Robert's followers also couldn't believe how big Grace had gotten.

"Can anyone tell me where the time has gone? In this picture, Grace looks more grown than ever. 🤔🥰😅 Little warrior already so big," one commented.

"She’s a big girl! When did that happen?" someone else wondered while another fan wrote in utter disbelief, "omg there’s no way she’s grown up this much! whatttttt!!! 🥹🙈."

Grace, the only child of Bindi and her husband, Chandler Powell , celebrated her third birthday in March. And judging by her Uncle Robert's regular updates including the 3-year-old , Grace is seriously smitten with the former Crikey! It's the Irwins star.

Next: Robert Irwin Honored With Prestigious Title From Prince William—And It Has a Special Connection to His Late Dad Steve