Katy could poll off Adele, definitly wouldn't sound as great live, but the recorded versions would slay
As for Adele recording, performing, music videos for I Kissed A Girl, Hot N Cold, Waking Up In Vegas, California Gurls, Teenage Dream, Last Friday Night, and E.T.

I can see Adele pulling off Thinking Of You, Firework, The One That Got Away, Part Of Me and Wide Awake
