Last night's episode of David Letterman may have been the prettiest ever! Katy Perry perform 'Teenage Dream' (and landed a coveted spot in the chair before her song, which is rare for a musical guest!), but he he entertained the delightful Drew Barrymore!

Dave and Drew go back a long way, I think he brings out the best in her. They chatted about her trip to India (lots of her spiritual nattering), and compared dogs (she just added one, as did he, but with different experiences!). She mentioned the film, but when he asked if there was a boyfriend, she deftly side-stepped him and said "you're my boyfriend, Dave". No Justin Long confirmation..

As for her fashion,

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