Ashton Kutcher surprised Mila Kunis' parents by renovating their home.

The 37-year-old actor, who has a daughter Wyatt, one, with his actress wife, reportedly decided to overhaul his in-laws Mark and Elvira Kunis' West Hollywood house to show his appreciation for them regularly babysitting their little girl.

A source told America's OK! magazine: ''Mila's mom was so emotional when she saw the house. Ashton thinks they really go above and beyond the call of grandparent duty, so he wanted to make a grand gesture.''

The former 'That 70s Show' star splashed out $100,000 to revamp their kitchen, bathrooms and add a nursery to their property.

Ashton previously shared that the pair are enjoying bringing up their daughter without a nanny.

He said : ''We're really privileged that we have time and can afford to take time. So we don't have a nanny or a night nurse of any of that stuff. It's just the two of us.''

Earlier this year, the actor also renovated his mother's home in Homestead, Iowa for Mother's Day and documented the process online.

He said at the time: ''It's my way of saying thank you to my mom. My mom has been the greatest influence in my life - my parents gave me everything. They went to great sacrifices to give me the life that I have and anything I can do to say thank you is the right thing.''