The mum-to-be beamed as she walked the red carpet at the Four Seasons hotel to celebrate her film The Imitation Game being honoured by the AFI.
Keira's radiant smile was also no doubt down to her recent BAFTA nomintaion.
The London-born star is up for the title of Best Supporting Actress for her role in historical thriller The Imitation Game, which is also nominated for Best British Film.
Also vying for the award are Emma Stone for Birdman, Imelda Staunton for Pride, Patricia Arquette for Boyhood and Rene Russo for Nightcrawler.
Keira's role has also landed her a Golden Globe nomination. The star is in LA for the glittering ceremony which takes place on Sunday night.