Thinking of this highly unlikely and probably improper idea, we wondered just what we'd expect to see from her account.
We've got some theories.
Pictures of Prince George
We have already fallen head of heels for Prince George's grumpy face.
Let us see more Kate. Miranda Kerr's all over adorable snaps of Flynn on Instagram.
When you're a Duchess it seems one has someone else to carry one's belongings.
Well, we're convinced Kate's got an impressive handbag collection we haven't seen yet.
Make like the celebs and show off your handbag collection, until then we'll hold out for that royal #HandbagSpy.
When she's not jetting off on a tour of New Zealand and Australia she's up in the hills of Balmoral.
That's got be full of picture opportunities just crying out for a filter.
She just need to make sure she doesn't fake it like Kim K tried.
Doesn't a little part of you want to see whether Kate Middleton and Prince William could compete with Olivia Palermo and her finace for stylish yet adorable couples photos?
Is that creepy of us?
Kate's beauty secrets
Celebrities have recently taken to sharing some of their awesome beauty secrets and favourite products on Instagram.
We want to know how she gets that perfect hair. We mean specifics.
Here are the ones other celebs have shared.
KATE MIDDLETON GOES NATIVE
INSTAGRAM OFFICIALLY KILLING OFF FACEBOOK
MORE CELEBRITY FUN