Kylie is sat on the rapper's lap as he affectionately cuddles her from behind.
But it didn't take long before eagle-eyed fans noticed a weird lump on her left leg.
"She has a nipple on her knee," one wrote underneath the shot.
"It's a nipple on her shrunken leg!!! I thoroughly enjoy these stupid girls. Money can't fix stupid!" wrote a second.
But others pointed out that it was likely to be a plant in soft focus.
"Totally thought she had a wart on her knee. But it's all perspective - something in front of her knee hahaha," a third shared.