Pregnant Keira Knightley offers a rare glimpse at her blossoming shape as she and hubby James Righton jet out of London hand-in-

She's managed to largely disguise her baby bump throughout awards season.

But jetting out of London after the BAFTAs on Tuesday, Keira Knightley was revealing the extent of her pregnancy shape in a sweet ruffle front dress and a leather jacket.

Keira, 29, and her 31-year-old husband James Righton looked blissfully at ease, walking hand-in-hand through Heathrow for an afternoon flight, their showbiz sunglasses perched on their noses.

Showing her shape: Keira Knightley gives a rare glimpse at her baby bump as she arrives at London's Heathrow airport with her husband James Righton (left)

Bump on board: Keira made strides with swinging arms to reveal a look at her growing shape