Get ready to witness a Katy Perry tour shakeup.

Perry, who was supposed to hit the road for her next round of shows starting September 7 in Ohio, has delayed her Witness Tour by about two weeks because of unforeseen complications that have caused hiccups in her rehearsal schedule.

“Due to unavoidable production delays, major elements of my tour stage design could not be available for me to rehearse on until this week,” Perry said in a statement. “I’ll be spending the next few weeks taking the time to properly prepare the show to be an experience I am proud to share with you. I’m sorry for any inconvenience this causes, but hope everyone who sees the show will agree it was worth the wait. My first show on WITNESS: The Tour will be in Montreal on September 19.”

But, good news: Once the tour does get going, fans have got some seriously awesome opening acts to look forward to. Noah Cyrus, Carly Rae Jepsen and Purity Ring will all support Perry.

You can check out the updated tour dates on Perry's website. Her team has described the tour as "an imaginative trip from outer-space to inner-space, from the planets to the bottom of our oceans, and a musical journey through Katy Perry’s biggest milestones and mega-hits right up to her latest album."

All of Katy Perry's Singles' and Albums' Cover Art: