And the workouts are clearly paying off as she showed off her washboard stomach today.
Wearing a polka dotted cropped T-shirt and a pair of ripped boyfriend jean, the Friends With Benefits actress treated herself to a manicure and pedicure in Los Angeles today.
The actress has been working out on a near daily basis to get her body in great shape for Jupiter Ascending.
The star, who turned 29 last week, stars alongside Channing Tatum in the sci fi movie which is slated for a 2014 release but due to commence production soon.
Although Kutcher, 34, and Kunis are said to be living together and were snapped holding hands as they boarded a plane in Bali earlier this month, they have continued to stay mum on the official status of their relationship.
In an interview with British Elle in August, the Ukranian born star went so far as to say she was 'totally single' and that she and Ashton were just friends.
'Listen, [Ashton and I] hang out. We've known each other for 15 years. We have mutual friends,' she said.
'We're comfortable with one another. That's it! There's no crazy love story, nothing mo