Justin Stalls 'N Sync's Greatest Hits

Singing superstar Justin Timberlake's reluctance to return to 'N Sync has delayed the release of their greatest hits album.

The LIKE I LOVE YOU singer is needed to record vocals for three new tracks which will feature on the GIRLFRIEND group's new CD but has yet to agree to return to the studio.

While bandmates Jc Chasez, Joey Fatone, Lance Bass and CHRIS KIRKPATRICK are ready to reform but even top executives at JIVE RECORDS have failed to convince Justin to join them.

A source tells Britain's DAILY MIRROR newspaper, "There's meant to be a greatest hits coming out in November and a possible Christmas TV special, but it's all now up in the air.

"Justin's had so much success that he doesn't need to get back with the band. He's also very busy and finding the time to do stuff with the band is hard, but if he really wanted to make it work, he could."