Ashton Kutcher was in awe of co-star Kevin Costner whilst filming their new movie The Guardian together.

The pair were speaking to USA Today when the Punk'd presenter revealed his adoration:

"I'm from Iowa, so I was born and raised on 'If you build it, they will come' - the famous line from his baseball film Field of Dreams. When you see films like JFK or The Bodyguard you realize there aren't very many guys that don't disappoint and Kevin is one of them."

But the gushing was not one-way traffic, as Costner returned the compliment:

"Everybody wants to limit him and everybody keeps being wrong about him. And
that's because they're playing catch-up. He's already on to his next thing."

Kutcher did find time to poke fun at his hero when he had a quick kip during filming.

"I'm like this (snoozing) and he's got this towel held up behind me and it says 'Action Hero' and points to me," laughed Costner.

Kutcher added: "I got a good picture of it. That will never be released."