United Kingdom, Jan. 11 -- Will Arnett was "intimidated" by his Is This Thing On? co-star Laura Dern at first.

The pair play a divorcing couple in the Bradley Cooper-directed movie and the 55-year-old actor has confessed that he felt a sense of trepidation before production started as he is a huge fan of the Jurassic Park star.

Will explained to People: "I was nervous. If the scale is one to 10, I was probably a million.

"And... I kind of had this moment early on where I admitted to Laura - I so admire her work over all the years, everything she's done. I look up to her. She's such a beautiful artist and performer and all of these things. And I said, 'I'm gonna be honest with you. I'm intimidated by it, and I'm going into deeper water ...