Looks like some semi-official confirmation here as well.
http://www.mtv.com/news/articles/1451630/20020102/n_sync.jhtml?headlines=true
A few of the 'NSYNC guys will appear in "Star Wars - Episode II: Attack of the Clones," according to a spokesperson from Lucasfilm.
The spokesperson didn't know specifically which members have cameos in the movie, which will be the fifth "Star Wars" release from creator George Lucas. The guys will be seen for a fleeting moment in a "big scene with lots of extras."The roles materialized after the group members, who are all fans of the sci-fi saga, asked the new film's producer, Rick McCallum, for bit parts.