Watch Selena Gomez + ‘Spring Breakers’ Cast Cover Britney Spears Live at SXSW

To prove the cast of 'Spring Breakers' didn't lip sync in one of their movie scenes, they were asked to perform an impromptu karaoke version of Britney Spears' 'Baby One More Time.'

The allegations seemed preposterous to Selena Gomez in the first place as she remarked, "I'm so confused. They thought we were lip syncing? It doesn't even sound good though!" It didn't take much convincing to get Gomez to lead her co-stars, Ashley Benson and Rachel Korine in a short and sweet rendition of Spears' 1998 hit. And don't for one second think Britney Spears didn't see the video! She tweeted: