Katy Perry Bares Midriff at Sydney Opera House!

Katy Perry is colorful green while arriving back to her hotel on Monday (October 28) in Sydney, Australia.

The 29-year-old singer was seen posing for pics and signing autographs for fans, who had awaited outside the hotel.

PHOTOS: Check out the latest pics of Katy Perry

Earlier in the day, Katy showed off her midriff while wowing the crowd during a performance at the Sydney Opera House.

“Typically, I hate mornings, but this morning is unlike any other morning! I get to see the @sunriseon7! 20 more min until I’m LIVE on air!” Katy tweeted on the same day.

Check out Katy performing her new single “Unconditionally” and “Roar” below on X Factor Australia last night!

FYI: Katy is wearing the Valtari Necklace in Pale Gold by AllSaints.

Click inside for Katy’s performance of “Roar”…