Justin Timberlake's grandmother thinks he will be an ''amazing'' parent.

The 'Mirrors' hitmaker married Jessica Biel last October and his gran Sadie Bomar says he is already a ''great husband'' and she expects the couple will want to start a family soon.

Sadie said: ''He's making a great husband.

''Justin is going to make an amazing dad. They want a big family, so I guess it won't be too long. They are the most lovely couple.''

In his latest music video for 'Mirrors', Justin pays tribute to his grandparents and Sadie - whose husband Bill passed away in December - admits the film was a ''surprise'' but she thinks it is a ''lovely tribute''.

She told Grazia magazine: ''Justin didn't tell me he was doing it, it was a surprise.

''He said, 'You have to see this video, just you sit down and watch it.' I was moved by it, it brings tears to my eyes. It's a lovely tribute to us.

''I like the way [Justin] catches my wedding ring, like he's the husband now. I am close to Justin and it was a lovely, beautiful thing to have done. That's how he is.''