The band then toured with her on the UK dates of her Hello Katy Tour in February 2009 .
3OH ! 3 was among the line - up of the Warped Tour 2008 where they met Katy Perry .
The band then toured with Katy Perry on the UK dates of Katy Perry 's Hello Katy Tour in February 2009 .
3OH ! 3 was among the line - up of the Warped Tour 2008 where they met Katy Perry .