Justin Timberlake's grandmother has admitted she shed tears after watching her grandson's video tribute to her and her late husband.

The '20/20 Experience' star opened his recent 'Mirrors' video with a written homage to his grandmother and late grandfather before using them as inspiration in the rest of the clip.

The video sees an older couple reflect on the times they had together previously.

Speaking to Grazia, Timberlake's gran Sadie Bomar revealed that she was "moved" by the emotional and unexpected tribute. She said:

"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."

Timberlake's grandfather William died late last year after a 63-year marriage to Sadie.