Watch: Best Coast plays Letterman

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Remember that day your little sister got into the college of her choice? You'd watched her grow up from an awkward nose-picking, sleepover-hosting little girl into an slightly-less-awkward adult with oversized eyeglasses and a Facebook profile. 

That's kind of what it's like to watch Best Coast play in front of David Letterman, as they did last night. Sure, you knew them as that catchy little group that sang almost exclusively about crushes and cats and cannabis. But now they're all grown up and ready for network television.