Within weeks of its posting in September 2011, the youthful duo were whisked onto The Ellen Show, where they soon became regular contributors, hosting their own segment and filming red carpet interviews for the show.
Worldwide recognition followed, as the pair released their own singles, movie, published two story books and even released a line of dolls.
It's now been eight long years since the adorable twosome found fame — and as her recent Instagram posts show, 16-year-old Sophia Grace now looks completely different:
These latest photos of Sophia Grace have caused something of a stir on social media this week — clearly, a lot of people out there still picture her as a tutu and tiara-wearing eight-year-old:
Also causing a stir: Sophia Grace's recent Father's Day post, and her disarmingly handsome Ryan Reynolds lookalike of a dad:
"Hey Sophia Grace can I get your dad's cell … I just wanna wish him a belated happy Father's Day," was just one of many thirsty social media responses to the pic.
And as for Sophia Grace's shy little sidekick, Rosie? She's now a 12-year-old, LA-based professional YouTuber detailing her daily skincare routine to her 650k-odd subscribers:
So. Who else suddenly feels ancient?