Credit: Ashton Kutcher on Twitter Photo: Ashton Kutcher and Mila Kunis Kiss in December 2013

Ashton Kutcher is one of the highest-paid actors on TV and Mila Kunis regularly tops the sexiest women alive lists. But they're still so normal.

The former That '70s Show co-stars are now back in Iowa with his family, a source told Life & Style. They flew into Cedar Rapids on December 14 and they’re staying until after Christmas, just like they did last year.

The source said they'll spend Christmas Eve with Ashton's mom, then Christmas Day with his dad. "They love hanging out with his big family, and they love spending time with the kids over the holidays," the source told L&S. They were spotted shopping at a local Target and an eyewitness told the magazine the pair are "always so calm and casual" when they're in the area.

You can also see them in the stands at the Iowa vs. Penn State wrestling match on December 21.

Just a couple of weeks ago they were in Florida with Mila's parents for her brother's wedding. Will their own wedding be coming soon? They obviously get along with each other's families, and you can't say they don't know each other well since they've been friends since their sitcom launched in 1998. Plus, Ashton has finally settled his extended divorce from Demi Moore.

Ashton and Mila like to keep things private, so we may not see a big announcement from them about an engagement. In fact, for all we know they are already engaged and just don't feel like sharing it. Either way, congrats to them on making this whole celebrities in love thing look surprisingly easy and normal!

Sources: Life & Style, Big Ten Network