Most shocking celeb lip-syncing scandal?

So did she or didn't she?

It's certainly looking like Beyonce DID lip sync at President Obama's second inauguration, shocking fans who are wondering why the pop star –who really can sing-- would botch such a major gig.

SODAHEAD SLIDESHOW: See the most shocking celebrity lip-syncing scandals.

But Beyonce is definitely not the first celeb to find herself in the middle of a singing scandal. Madonna was accused of lip-syncing her way through her Super Bowl performance, and the band Milli Vanilli was said to have lip-synced just about every song they performed.

Ashlee Simpson was also said to lip-sync on “Saturday Night Live.”

PHOTOS: See the latest celebrity pictures to hit the Internet.

From Beyoncé to Ashlee, let us know: Who had the most shocking lip-sync scandal?