Liv Tyler has celebrated Halloween with an unusual costume – a bun in the oven.

The 37-year-old actress, who is expecting her second child, made light of her pregnancy with the outfit, pictures of which she shared on Instagram.

Liv – who is mum to nine-year-old Milo, whose father is musician Royston Langdon – wore the outfit for her son’s school Halloween dance and decided to dress up her theme of being pregnant by wearing a bun in the oven costume.

She was even seen dining out wearing her outfit at a restaurant.

Earlier in the day, the 37-year-old star – who is dating British boyfriend Dave Gardner – showed off her maternity chic, dressing her blossoming bump with a pink and black floral-print tunic featuring a white lacy hemline, as she strolled outside of her Halloween-decorated apartment in New York.