Sitting in the passenger seat of the car, she bore a striking resemblance to a private detective.
With a trilby on her head, cigarette in mouth and phone to her ear, she appeared hard at work on a case.
On the case: Kate Moss smoked a cigarette as she chatted on the phone
Kate, who turned 35 two weeks ago, was pictured leaving a friend's house in north London with boyfriend Jamie Hince.
The pair looked relaxed and happy as they strolled along the street arm in arm to the car.
She appeared to be carrying a bag of shopping from sexy lingerie company Agent Provocateur.
Kate buttoned up against the cold in a sturdy tweed jacket that added to her detective chic.
Hat's the way to do it: The model worked the detective look in a grey trilby
Arm in arm: Kate and boyfriend Jamie Hince looked relaxed in each other's company as they strolled along the street in north London
It has a look that seems to be popular with other female stars.
Victoria Beckham stepped out in a long trenchcoat and trilby last year.
And actress Katie Holmes, whose friendship with Victoria appears to be back on track after a rumoured falling out, later wore a similar outfit herself.
She was photographed in a beige belted coat and black cap that could have been inspired by fictional detective Inspector Clouseau.
Snap: Katie Holmes and Victoria Beckham have both stepped out in steps out in Inspector Clouseau-inspired outfits
