alanis morissette crystal bowersox 'American Idol': Crystal Bowersox, Alanis Morissette on 'You Oughta Know'One of Crystal Bowersox‘s big performances during the “American Idol” Season 9 finale was a duet with Alanis Morissette. Crystal started off on “Ironic,” which thankfully was not the end of the number.

Alanis strutted out onstage as the familiar strains of “You Oughta Know” kicked up and they launched into one of the rockingest performances of the night. You also had to love the sanitized “You Oughta Know” lyrics — “Would she go down with you to the theater.”

“You Oughta Know” was a hit back in 1995 — doesn’t that make you feel old? — and we love that now it has been introduced to a whole new generation of young girls. Go download it, girls! Find the real lyrics!

Watch the rockin’ duet below! What do you think? Best performance of the night?

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credit: FOX

Posted by:Andrea Reiher

TV critic by way of law school, Andrea Reiher enjoys everything from highbrow drama to clever comedy to the best reality TV has to offer. Her TV heroes include CJ Cregg, Spencer Hastings, Diane Lockhart, Juliet O'Hara and Buffy Summers. TV words to live by: "I'm a slayer, ask me how."