Jordin Sparks will be replacing Ciara on the second leg of "The Circus Starring Britney Spears" tour, reps at Jive Records, both Sparks and Ciara's label, has confirmed.

In a press release on Spears' official website, it was announced on Friday (Aug. 14th) that Sparks will be the opening act for the U.S. portion of the trek. The release also states opener Kristinia DeBarge will continue to perform on all dates while up-and-coming acts Girlicious and One Call will appear in select cities.

Although asked, Jive Records didn't give a reason for the switch.

Leg two of "Circus" kicks off August 20th in Hamilton, Ontario and ends on September 27th in Las Vegas, Nevada.

Here are the dates:

Aug 20: Hamilton, ON (Copps Coliseum)
Aug 21: Ottawa, ON (Scotiabank Place)
Aug 24: New York, NY (Madison Square Garden)
Aug 25: New York, NY (Madison Square Garden)
Aug 26: New York, NY (Madison Square Garden)
Aug 29: Boston, MA (TD Garden)
Aug 30: Philadelphia, PA (Wachovia Center)
Sept 1: Orlando, FL (Amway Arena)
Sept 2: Miami, FL (American Airlines Arena)
Sept 4: Atlanta, GA (Philips Arena)
Sept 5: Greensboro, NC (Greensboro Coliseum)
Sept 8: Detroit, MI (The Palace of Auburn Hills)
Sept 9: Chicago, IL (Allstate Arena)
Sept 11: Des Moines, IA (Wells Fargo Arena)
Sept 12: Grand Forks, ND (Alerus Center)
Sept 15: Tulsa, OK (BOK Center)
Sept 16: Houston, TX (Toyota Center)
Sept 18: Dallas, TX (American Airlines Center)
Sept 19: Bossier City, LA (CenturyTel Center)
Sept 21: El Paso, TX (Don Haskins Center)
Sept 23: Los Angeles, CA (STAPLES Center)
Sept 24: San Diego, CA (San Diego Sports Arena)
Sept 26: Las Vegas, NV (Mandalay Bay Events Center)
Sept 27: Las Vegas, NV (Mandalay Bay Events Center)