The 37-year-old actress, who is expecting her second child, sported a printed dress and a black V-necked jumper that flattered both her toned figure and her growing stomach.
On Thursday People magazine confirmed that Liv, whose father is Aerosmith rocker Steve Tyler, is expecting baby number two.
Liv is said to be "delighted" to be pregnant again
Liv, who is currently dating British sports agent Dave Gardener – a close friend of David Beckham, is already a mum to nine-year-old Milo with her ex-husband, British musician Royston Langdon.
Sources have said the star is "delighted" by the news and that she was "really trying for another baby".
The couple have been pictured together out and about in the last four months after being introduced by mutual friend Kate Moss.
The actress is already mum to son Milo
In July they joined the supermodel and her husband Jamie Hince on holiday in Spain.
Liv has made no secret of her desire to have more children. In a recent interview with the Sunday Telegraph's Seven magazine, she said, "I'm 100 per cent planning on it.
"If the stork could just drop it off on my roof, I'd be so happy – I'd have, like, 20."