Kristen Bell found it hard to star alongside her husband Dax Shepard in 'CHiPS' because he's ''so endearing''.

The 36-year-old actress stars as Karen Baker in the upcoming action comedy movie - which is based on the 1970s TV show of the same name - and has said she had trouble being ''mean'' to the 42-year-old actor, who plays her on-screen husband Officer Jon Baker, because she ''likes him so much''.

Kristen - who has two daughters Lincoln, three, and Delta, two, with Dax - said: ''It was hard to be mean to him because my character is his estranged, trophy wife... and it was difficult because I do really ... he's so endearing, and I like him so much.''

And Kristen says she did her best to learn to dislike her spouse - whom she tied the knot with in 2013 - during filming, and drew on the experiences of all the little arguments they've had throughout their romance, which has spanned a decade.

She added during an appearance on 'Good Morning America' on Friday (24.03.17): ''From an actor's perspective I was like, 'Hmm, I'll take the 15 times he's really annoyed me in our last 10 years [together] and I'll put those all into a Coke bottle, pop a Mentos in there, shake it up and then that will be Karen.'''

Meanwhile, Dax - who also took on directorial duties for the movie - recently revealed he directed the feature in the nude, and said although he initially concealed his modesty when having to step behind the camera, he eventually shed his inhibitions as well as his clothes.

He said: ''I think in the morning I started off putting my robe on in between every take when I would go over and talk to the camera department.

''But, as less and less time was available to us, I found that I was not putting my robe on between takes and I'd be like, 'Wow, I haven't put on any clothes on in three or four hours and everyone seems to be fine with it.'

''By the way, that was the second day of filming, so I was relative strangers with most of the people, except for my department heads. The rest of the people were new faces.

''And [Michael] Peña and I didn't know each other, so that was day two for him as well.''