Mila Kunis celebrated her 31st birthday at an ice-cream parlour.

The 'Friends with Benefits' actress, who is set to give birth to her first child in ''less than a month,'' was spotted enjoying a ''very playful'' romantic date with fiancé Ashton Kutcher, 36, at Sweet Rose Creamery on Beverly Boulevard in Los Angeles to mark the special occasion on Thursday (14.08.14).

A source told ''They were very playful, grooving to the music playing in the shop, and clearly just really focused on and into each other!

''He was totally doting on her - rubbing her belly and opening the door for her.''

The eyewitness added: ''They looked so in love and were acting goofy!''

The 'Ted' star, who is expecting a baby girl, also attended a prenatal yoga class earlier in the day, where she was given a bouquet of purple flowers for her birthday.

The former 'That 70s Show' star recently admitted she is looking forward to marrying her old co-star, and is believed to be preparing to walk down the aisle next July.

She previously said: ''I never wanted to get married. From the age of 12, I prepared my parents for no marriage. Then things changed - I found the love of my life. Now my theory on weddings is: Don't invite anyone. Do it privately and secretly. My parents are okay with that. They're just excited that I said yes.''