Kevin O'Leary has "no idea what the rules of acting are".

The 71-year-old TV star has made his film debut in Marty Supreme, the new sports comedy-drama movie produced and directed by Josh Safdie - but Kevin acknowledges that he's not an accomplished actor, admitting that he basically plays his real-life self in the film.

He told The Hollywood Reporter: "I have no idea what the rules of acting are. I really don't. I don't give a s***. I'm never going to take acting lessons.

"I felt that I am Milton Rockwell -- if I was in 1952, that would be me."

Kevin is well-known for his outspokeness, and he successfully campaigned for a change to the Marty Supreme script.

The film is loosely inspired by the American table tennis player Marty Reisman, but Kevin wasn't entirely satisfied with the original ending.

He explained: "I felt at the end that Marty had not paid the price that he should have. I was deeply dissatisfied with the ending. … There's no way in real life I would let this little f***** get away with this."

Kevin stars in Marty Supreme alongside Timothee Chalamet and Gwyneth Paltrow, and he admits that he has no interest in working with AI actors in the future.

He said: "I don't want to act with an AI agent -- how's that going to work? I don't know how you can do it any other way than just have those actors in that moment. Or if an extra is in an interaction with the principal, you can never use AI because you'll never have the cadence. It won't work next year. It won't work the year after that."

Meanwhile, Gwyneth recently revealed that she jumped at the chance to star in Marty Supreme.

The Oscar-winning actress decided to end her acting hiatus in order to appear in the movie, and Gwyneth insists that she has zero regrets about her decision.

The Hollywood star told Variety: "Marty Supreme came about in an incredible way because our boys were going off [to college] and I was left with this feeling of shock and disbelief. Like, 'Who am I?'

"Then I met Josh Safdie and I knew this would be worthwhile. This felt like the movies we used to make in the '90s."

By contrast, Gwyneth admitted that she "felt a lot of loneliness" in her 20s.

The actress ultimately turned her back on the movie industry in order to focus on her lifestyle brand, Goop.

She said: "I felt a lot of loneliness when I was doing it in my 20s. I didn't know myself well yet, and I was travelling all the time. I needed to grow up and understand who I really was, and I got a lot of those answers through my family. Then I started a business."