Halle, 46, was pictured holding 47-year-old Olivier's hand yesterday (11 June) while they wandered around the French capital together.
The Hollywood actress dressed her bump in a black stretch maternity top and long grey skirt. She also popped on a grey cardigan and a comfy pair of flat sandals.
Walking around Paris all day can be hard on your feet at the best of times, let alone when you're five months pregnant!
Halle's hair, which was swept to the side, is also looking a little longer than it has been in recent years. She's such a yummy mummy!
Check out who else is expecting a baby in our gallery below.