Justin Timberlake's son is already a big fan of 'Trolls'.

Justin Timberlake

Justin Timberlake

The 'Can't Stop the Feeling' singer voices grumpy Branch in the animated adventure and 18-month-old Silas - who he has with wife Jessica Biel - can not only recognise his dad's dialogue but he knows who all the other characters are too.

Asked if Silas can recognise his voice, Justin, 35, said: "He knows all the characters already! It's crazy!"

As well as starring in the movie, Justin was also musical producer on 'Trolls' and so got to see the final cut of the film before anyone else as he had to ensure the soundtrack was "working out".

He explained to 'Entertainment Tonight' presenter Cameron Mathison: "I got to screen it before anybody. I had to screen it before everybody because I had to make sure all the music was working out."

The 'SexyBack' singer and co-star Anna Kendrick have been promoting 'Trolls' since May but he insists it hasn't got tiring talking about the film yet.

He said: "We made a joke the other day that we feel like our only job now is just to promote this movie.

"[But] it's always nice to be a part of a movie that brings so much happiness to people."

Interviewer Cameron brought his 10-year-old daughter Leila along to the Los Angeles premiere of the movie at the Regency Village Theater in Westwood, California on Sunday (23.10.16) and Justin had some words of advice for the youngster.

After Leila congratulated him on his recent fourth wedding anniversary, he said: "Oh thank you! Take your time. Don't get married too fast, alright?... I'm trying to look out for your dad! Boys are ick!"

And the aspiring singer also asked the pop star for advice on starting a music career.

Speaking on his knees on the rainbow carpet, he joked: "Don't do it! No, I'm kidding. Practice, practice, practice. That's my advice.

"This is officially the first interview I've ever done on my knees. I gotta say, I'm really enjoying it."

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