The actress displayed her growing baby bump in a loose patterned dress as she walked the red carpet at the Audi-sponsored event on Thursday night (21 August).
Zoe's glamorous outing came the same week she officially confirmed her pregnancy, although the blossoming bump meant her secret was out a while ago.
It will be the first child for Zoe and her artist husband Marco Perego.
Zoe, 36, confirmed her happy baby news after being nominated to do the ALS ice bucket challenge, which asks people to chuck a bucket of cold water over their heads and donate to the organisation, which raises money for research into motor neurone disease.
The Avatar actress explained in her challenge video that she couldn't do it herself as she's pregnant, but her husband was going to step in and do it instead.
What a gent!
Stars who welcomed babies in 2014 in pictures:
Copyright: Rex Features WENN/Matthew Taylor/Daniel Deme/Josiah True/Matthre Taylor/Joe