Katy Perry Shows Off Midriff in Flashy Outfit at Radio 1's Big Weekend!

Katy Perry rocks a shimmering ensemble while performing live at Radio 1′s Big Weekend at Glasgow Green on Sunday (May 25) in Glasgow, Scotland.

“Woke up from my nap via bagpipe player out my window. I must be in Glasgow… #radio1bigweekend,” the 29-year-old entertainer tweeted earlier in the day.

PHOTOS: Check out the latest pics of Katy Perry

In case you missed it, check out Katy and her BFF Kacey Musgraves on the cover of Billboard, where she talks about seeing Kacey naked a few times.

10+ pictures inside of Katy Perry performing at Radio 1′s Big Weekend…