During the filming of AOTC, N'sync was allowed to visit the set in Australia while they were filming the arena battle. It gets a little fuzzy here, but they ended up dressing up as arena Jedi and being filmed. This isn't a rumor, but there were plenty of rumors as to why they were there. Given that the arena Jedi were nothing more than LFL employees, I'm not surprised. Anyway, their footage ended up 'not being used'.