The 25-year-old arrived at Heathrow airport and cut a suitably stylish figure as she made her way to her flight.
Hilary showed off her trim shape in a pair of tight black skinny jeans, a white T-shirt and a black leather jacket.
Jet set: Hilary Duff was seen arriving at Heathrow airport less than 48hours in the UK
Hilary was late to the airport because she had spent so much time shopping at Vivienne Westwood and tweeted a picture of the boutique bag.
The mother-of-one, who gave birth to her son last March, has been showing off her trim shape during her quick trip to London.
Showing off her post baby shape: The 25-year-old
singer was seen leaving Claridges hotel earlier in the day and enjoyed a
shopping trip in the capital
Out and about: Hilary was seen in a pair of
tight skinny jeans and a grey jumper as she made her way out and about
from her hotel on Wednesday
Now nearly a year since she and her spouse - retired professional hockey player Mike Comrie - welcomed their first baby into the world, she has lost 30lbs and is ready to return to work.
She told Us Weekly: 'My one trainer helped me lose a s**t ton of weight. I lost like 30 pounds. His name is Gabe Johns and he is amazing.
'He's a boxing trainer and he comes to my house. I live in the canyon, so we just run. He runs my ass up and down the hill.'
Out and about: Hilary was seen hitting the town out in Mayfair on Tuesday night