Katy Perry knows online critics ... is important to me,” the “Firework” and “California Gurls” singer said Tuesday on Instagram. Perry, 40, wrote about how she moves past online scrutiny ...

Katy Perry has gushed about fellow pop star Lady Gaga. The California Gurls hitmaker was spotted ... but both artists have publicly supported each other's music and careers on several occasions.

Katy Perry’s working ... including the title track, “California Gurls,” “E.T.,” and “Last Friday Night (T.G.I.F.).” It’s only natural that Perry would enlist Dr. Luke for her ...

Kesha has thrown a subtle dig at Katy ... assault. Perry has frequently collaborated with the producer on some of her biggest hits, including ‘I Kissed A Girl’, ‘California Gurls’ and ...

As she prepares to embark on her first world tour in seven years, Katy Perry needs ... her routine skews "California crunchy." But the night doesn't end after the "California Gurls" singer leaves ...