Katy Perry Live on Letterman TONIGHT 5pm PT / 8pm ET

We'll keep this one short - watch Katy Perry, Live on Letterman 5pm Pacific / 8pm Eastern, in an exclusive online concert streaming live from New York's Ed Sullivan Theater, featuring songs from her new album Teenage Dream!

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BRAVO MAMAMIA
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I love Katy Perry,I probablly won't be tuning in though.
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