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We have serious Katy Perry fever at the moment -- so we joined hundreds of her Katy Cats for the Sydney Premiere of her 3D documentary Part Of Me, and got the chance to speak to the beautiful lady herself!

Katy was thrilled to be in Australia for the premiere of the film, but we had to ask her what it was like partying with Justin Bieber, Selena Gomez and Robert Pattinson after her LA screening.

She told thehothits.com, "There wasn't really any partying, cause when I party I party! I party like Andrew W K style, I crowd surf!"

"But no we were just hanging out, I love Selena and we have a lot of mutual friends and Justin's always been so nice to me and Robert somehow got stuck in all of this!"

Katy also revealed that her parents aren't always the biggest fans of some of her songs!

She said "They probably like only nine of the ten songs, or maybe nine of the twelve songs, but that's still good, it's good enough. I'm kind of the black sheep of the family!"

We also spoke with The Voice star Sarah De Bono -- who said she was looking to hit up Katy for some advice... on her hair!

Check out the full chat below! And stay watching for our interviews with Katy and friends at the LA premiere of Part Of Me.