Justin Timberlake's grandma has started planning his wedding to Jessica Biel, say reports.

According to The Sun, Sadie Bomar wants her grandson to wed the actress in a private ceremony in his mum Lynn's garden.

"I just want them to be happy," Sadie told The Sun. "Justin should get married in Lynn's back yard in Tennessee.

"She has a big yard with beautiful flowers. I think it would be perfect."

She added: "Jessica's really sweet. She's his age and isn't possessive. I think their personalities are a lot alike."

It was reported in May that Timberlake was considering settling down with Biel. The couple began dating in January 2007.

The 'SexyBack' singer's previous lovers include Cameron Diaz, Dannii Minogue and Britney Spears.

Justin Timberlake's grandma is planning his wedding to Jessica Biel, say reports.