Justin Timberlake it to perform a dance to Jessica Biel's favourite 'N Sync song at their wedding.
The Cry Me A River hitmaker has been rehearsing a surprise routine to his former band's track It's Gonna Be Me with his best man and ushers as he prepares for his nuptials to the Total Recall actress.
A source told The Sun newspaper: ''Justin has been working on this for months. Jessica used to love the track growing up and he wants it as a special treat. It will be very much tongue-in-cheek. There will be loads of exaggerated boy band moves and poses. She's going to love it.''
The 30-year-old pop star - who sold more than 50 million albums with 'N Sync - got engaged to Jessica, 30, last December and the pair are tying the knot in Brindisi, southern Italy, this weekend.
Celebrations began earlier this week as guests enjoyed a low-key drinks reception near Naples on Tuesday (16 October) and watched a an impressive fireworks display on Wednesday night (17 October).
The couple splashed out in order to celebrate their special day with all their friends and family, hiring a private jet to fly guests - including Saturday Night Live comedian Andy Samberg and music producer Timbaland - to Italy for the ceremony.