Ashton Kutcher hangs out with Mila Kunis' parents in London

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Ashton Kutcher's divorce with Demi Moore might be getting nasty, but that hasn't stopped him from getting more serious with girlfriend Mila Kunis. Kutcher has been spending a lot of time in London with Kunis while she's filming "Jupiter Ascending," and he was recently photographed spending some quality time with her parents Mark and Elvira.

The foursome kept things low key as they walked around the city carrying Starbucks coffee. They reportedly watched "Billy Elliot: The Musical" and hung out while taking some relaxation time. Kutcher and Kunis dined with Kunis' parents at the Duck & Waffle restaurant over the weekend as well.

"They looked really happy," an onlooker tells Us Weekly. "The weather was good and they were holding hands and swinging them as they walked. They seemed to be doing a lot of talking and joking with each other."

Kutcher and Kunis have made a point to keep their relationship "private" since they started dating in 2012. "You know, I've learned the hard way how valuable privacy is," Kutcher tells Elle. "And I've learned that there are a lot of things in your life that really benefit from being private. And relationships are one of them. And I am going to do everything in my power to have this relationship [with Kunis] be private."

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