The actress was looking blooming as the family enjoyed lunch at Hollywood's Riva Bella restaurant.
Halle was wearing a purple tie-dye maxi dress, which clung to her new pregnancy curves, revealing her petite bump.
She and Olivier announced they were expecting their first child together last month.
Halle is already a mum to five-year-old Nahla from her relationship with Gabriel Aubry, and she has been at war with her ex over custody, with a violent fight even breaking out between Gabriel and Olivier last year.
However, Nahla is looking forward to becoming a big sister, with Halle recently telling US chat show host Wendy Williams: "Every night, we do our prayers and she says, 'God, please bring me a bunk bed and a baby sister.' And I say, 'I can do one of those things, I know for sure. The other one, we've got to keep praying on.'"