Kacey Musgraves Celebrates Birthday With Katy Perry at Roller Rink [PHOTOS + VIDEO]

You won't believe how Kacey Musgraves celebrated her 26th birthday. In roller skates. Musgraves took over a roller rink, for a party with friends, including pop star Katy Perry.  They were all 'Gettin' our 8th grade on.'

Musgraves posted all the fun on Instagram, 'THANK YOU to Skateville in Burnsville, MN for havin' all of us out tonight and hosting an amazing time on my birthday. Can't wait to come back!'

Musgraves and Perry became friends while filming CMT Crossroads.  They are now touring together.