Ke$ha puts a sexy twist on the actually-I-wouldn't-get-too-close-I'm-not-sure-where-she's-been look.
She once defaced the Hollywood sign, except she actually didn't, it was all PR LOLZ.
Her songs are often very catchy indeed. It is impossible to not dance when listening to 'Take It Off'.
Ke$ha took LMFAO on tour with her, which will probably be regarded as a criminal offence in a few years' time, a bit like when people decided that elephant tusks were generally not the sort of thing you should make stuff out of and everyone had to get rid of their ivory kettles.