The beautiful actress chose a baggy, floating LBD to attend the premiere of new movie Third Person in Los Angeles on Monday evening (9 June).
Family Guy's Mila is expecting her first child with fiancé Ashton Kutcher later this year, although the notoriously private couple have kept all details under wraps.
During an appearance on The Ellen DeGeneres Show last month, Mila, 30, declined to reveal the baby's due date or whether it's a girl or boy, although she said the couple did have a name picked out.
She's also said she'll have a natural birth.
Mila walked the red carpet last night without Ashton, 36, who she met on the set of sitcom That '70s Show back in 1998.
They played girlfriend and boyfriend on the show, but real life romance didn't blossom until many years later.
Last month, a source told People that Ashton had been "doting" on Mila throughout her pregnancy, saying: "He has been taking such good care of [her]. He's doting on her and telling her she looks beautiful."
Mila's even revealed that Ashton stocked their secondary fridge with "weird food" like pickles and anchovies just in case Mila had cravings at any time - which she later did.
"I was like, 'Oh my God, I need a pickle.' It was just the weirdest thing. I needed this pickle, and he was like, 'Hold on a second,' and disappeared in the backyard and came back with the most amazing dill pickle of all time."
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Stars who announced pregnancies in 2014:
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