New Katy Perry single ' Walking On Air' is co-written by Camela Leierth. The cool 90's pop track enter at no.1 on iTunes US! "It's my favorite song off the record" Perry says in an interview with MTV. 

The album 'Prism' will be released on October 18 by Capitol Records. Besides Leierth's 'Walking On Air' UMP Scandinavia writers Bloodshy, Magnus Lidehäll and Vincent Pontare have co-written the track 'Love Me'.