It's been a year since Knox and Vivienne Jolie-Pitt made their entrance into the world in Nice, France.
And this weekend as they celebrated their first birthday on July 12 their famous parents were keeping the youngsters out of the limelight.
Since their introduction in HELLO! Brad Pitt and Angelina Jolie's twins have only been seen in public once, when they were rushed through Tokyo airport with their four siblings.
The absence of the youngsters from the spotlight has led to questions over their health, with one US magazine claiming they suffer from allergies.
"They’re both hypersensitive," Life&Style magazine quotes an insider as saying.
"Because of their delicate state, Knox and Vivienne need to be kept away from anything they could possibly be allergic to. That’s a lot easier to do when they’re home and in a controlled environment."