The bob-haired, expressionless models have been posing in formation everywhere from Diner En Blanc to the Black Opal Stakes to Enlighten to the Comedy Festival.

They remind us a bit of fashion's answer to the too-cool-for-school models in the classic Robert Palmer video for Addicted to Love.

The self-styled guardians have an account on Twitter and their main role seems to be spruiking fashion trends for autumn and winter.

We've heard it's a stealth advertising campaign for a shopping centre but the Canberra Centre and Westfield claim to know nothing. (Maybe the Molonglo Mall? Just kidding.)

The Canberra Centre told us: "They seem to be creating quite a buzz. We'd love to know if you hear anything". Mmm.

Others have suggested it might be a strike against Fashfest from disgruntled stylists. Our money is still on the Canberra Centre.

Whatever the case, it all seems very hush, hush with some in the know even signing confidentiality agreements to keep the cat in the bag.