Photo of Carly Rae Jepsen: Getty Images
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Katy Perry has some good news and some bad news about her upcoming Witness Tour.

She announced Thursday she has recruited Carly Rae Jepsen, Purity Ring and Noah Cyrus to open for the upcoming trek, although she has also confirmed the start of the tour has been pushed back from Sept. 7 to Sept. 19, kicking off in Montreal.

"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 today in a statement. "I'm sorry for any inconvenience this causes, but hope everyone who sees the show will agree it was worth the wait."

Perry, who is supporting her recent No. 1 album Witness, is hosting the MTV VMAs on Aug. 27, while Jepsen and Purity Ring have both been working on new albums, releasing "Cut to the Feeling" and "Asido," respectively, to serve as placeholders for the looming new material.

Katy Perry's updated live schedule:
09/19 — Montreal, QC — Bell Centre *
09/21 — Uncasville, CT — Mohegan Sun Arena *
09/22 — Pittsburgh, PA — PPG Paints Arena *
09/24 — Columbus, OH — Schottenstein Center *
09/25 — Washington, DC — Verizon Center *
09/29 — Boston, MA — TD Garden *
09/30 — Boston, MA — TD Garden *
10/02 — New York, NY — Madison Square Garden *
10/06 — New York, NY — Madison Square Garden *
10/08 — Newark, NJ — Prudential Center *
10/09 — Quebec, QC — Videotron Centre *
10/11 — Brooklyn, NY — Barclays Center *
10/12 — Philadelphia, PA — Wells Fargo Center *
10/16 — Louisville, KY — KFC Yum! Center *
10/18 — Nashville, TN — Bridgestone Arena *
10/22 — St. Louis, MO — Scottrade Center *
10/24 — Chicago, IL — United Center *
10/25 — Chicago, IL — United Center *
10/27 — Kansas City, MO — Sprint Center *
10/31 — Toronto, ON — Air Canada Centre *
11/01 — Toronto, ON — Air Canada Centre *
11/07 — Los Angeles, CA — Staples Center +
11/08 — Los Angeles, CA — Staples Center +
11/10 — Los Angeles, CA — Staples Center +
11/14 — San Jose, CA — SAP Center +
11/24 — Salt Lake City, UT — Vivint Smart Home Arena +
11/26 — Denver, CO — Pepsi Center +
11/28 — Omaha, NE — CenturyLink Center +
11/29 — Tulsa, OK — BOK Center +
12/01 — St. Paul, MN — Xcel Energy Center +
12/02 — Des Moines, IA — Wells Fargo Arena +
12/04 — Milwaukee, WI — BMO Harris Bradley Center +
12/06 — Detroit, MI — Little Caesars Arena +
12/07 — Grand Rapids, MI — Van Andel Arena +
12/09 — Indianapolis, IN — Bankers Life Fieldhouse +
12/10 — Cleveland, OH — Quicken Loans Arena +
12/12 — Atlanta, GA — Philips Arena +
12/15 — Tampa, FL — Amalie Arena +
12/17 — Orlando, FL — Amway Center +
12/20 — Miami, FL — American Airlines Arena +
01/05 — New Orleans, LA — Smoothie King Center ~
01/07 — Houston, TX — Toyota Center ~
01/10 — San Antonio, TX — AT&T Center ~
01/12 — Little Rock, AR — Verizon Arena ~
01/14 — Dallas, TX — American Airlines Center ~
01/19 — Phoenix, AZ — Gila River Arena ~
01/20 — Las Vegas, NV — T-Mobile Arena ~
01/31 — Sacramento, CA — Golden1 Center ~
02/02 — Portland, OR — Moda Center at Rose Quarter ~
02/03 — Tacoma, WA — Tacoma Dome ~
02/05 — Vancouver, BC — Pepsi Live at Rogers Arena ~
05/23 — Cologne, DE — Lanxess Arena
05/24 — Antwerp, BE — Sportpaleis Antwerp
05/26 — Amsterdam, NE — Ziggo Dome
05/29 — Paris, FR — Accorhotels Arena
06/01 — Zurich, CH — Hallenstadion
06/02 — Bologna, IT — Unipol Arena
06/04 — Vienna, AT — Wiener Stadthalle
06/06 — Berlin, DE — Mercedes-Benz Arena
06/08 — Copenhagen, DK — Royal Arena
06/10 — Stockholm, SE — Ericsson Globe
06/14 — London, UK — The O2
06/18 — Birmingham, UK — Barclaycard Arena
06/19 — Sheffield, UK — Sheffield Arena
06/21 — Liverpool, UK — Echo Arena
06/22 — Manchester, UK — Manchester Arena
06/24 — Glasgow, UK — The SSE Hydro
06/25 — Newcastle, UK — Metro Radio Arena

* with Noah Cyrus
+ with Purity Ring
~ with Carly Rae Jepsen