Katy Perry took the stage at The Grammy's, last night, and performed Not Like The Movies and Teenage Dream. The 26 year old singer flew in the air with a GIANT dress behind her! At the dress they projected a short movie of Katy Perry and Russell Brands wedding. After singing Not Like The Movies she screamed: And this on is for all the Valentine Lovers! Followed by Teenage Dream! Like always Katy wore a fun short dress with very much colors and glitters! Watch her performance below! Unfortunately Katy didn't win any Grammy award. Also Katy took her grandma to the Grammy's, how cute?!