The X-Men actress arrived back home in the US following a visit to France with fiancé Olivier Martinez, where she was promoting her latest movie.
Halle kept her look low-key as she strolled through LAX airport on Monday (17 June), but still managed to look effortlessly stylish in her all-black ensemble, simple heels and superstar sunnies.
The Oscar winner and her French partner confirmed last week that they are expecting a baby boy later this year.
Olivier broke the news while Halle was promoting her new movie Things We Lost In The Fire at the Champs-Elysees Film Festival in Paris on Thursday (13 June).
He told People magazine: "My son will be an American, but I remain French."
Halle, 45, is already mum to five-year-old daughter Nahla from her relationship with model Gabriel Aubry.