What you were watching was almost certainly a clip from the 2014 comedy film _The Interview_:
> Dave Skylark is the host of the talk show _Skylark Tonight_ , where he interviews celebrities about personal topics and gossip. […] Skylark discovers that North Korean leader Kim Jong-un is a fan of Skylark Tonight, prompting Rapaport to arrange an interview.
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> Kim eventually cries uncontrollably and soils himself after Skylark sings "Firework" by Katy Perry (having learned of Kim's fondness of Perry earlier), ruining his reputation.
Needless to say, this film is entirely fictional. In reality, Kim has never been interviewed by any American talk show hosts, and his tastes in American music are not known to the public.