What songs did Katy preform at the Grammy's?

Katy performed 2 songs. She performed part of Not Like the 电影院 and part of Teenage Dream. Hope this helped :)

~Not Like The Movies~ & ~Teenage Dream~

First, was ''Teenage Dream'' and right after that one was ''Not Like the Movies''!

not like the 电影院 and teenage dream

easy, not like the 电影院 and teenage dream