NBC has announced it's renewed The Biggest Loser for a sixth season that will follow the same "couples" format as the show's currently-airing fifth installment.

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"The current Couples season of The Biggest Loser has been one of the best and most compelling so far in this important franchise," said NBC executive Craig Plestis.  "We look forward to continuing to inspire and entertain viewers with more remarkable and life-changing weight loss stories."

The Biggest Loser's sixth-season 13-city casting tour will commence on February 16 with stops in Boston, Dallas, Chicago, Atlanta, New York City, Nashville, Oklahoma City, Miami, Columbus, Suffolk, Las Vegas, Mesa and Los Angeles -- all of which producers have deemed to be America's "fattest cities." 

Similar to the show's currently-airing The Biggest Loser: Couples edition, any two contestants with a pre-existing relationship -- including family members, spouses, dating or engaged couples, coworkers, former teammates or athletes, best friends and college students -- will be eligible to compete as a sixth-season "couple."

"It has been so satisfying to watch this franchise continue to grow," said executive producer JD Roth, "and Season 6 will be another opportunity to tell powerful, transformative stories of Americans getting their lives back in a healthy, positive way."

Alison Sweeney will reprise her role as The Biggest Loser's host for the show's sixth installment, which will also include trainers Jillian Michaels and Bob Harper.   No mention was made of Kim Lyons, who replaced Michaels as the Red Team's trainer prior to the show's third season but was replaced by Michaels for the show's fifth edition.

Prior to its fifth edition which premiered last month, all of The Biggest Loser's previous editions had aired as part of the network's fall schedule. Its sixth edition is likely to air this fall, according to an NBC spokesperson.

"The Biggest Loser has become a year-round success story for NBC," said executive producer Mark Koops.   "We're excited to continue making great primetime TV while inspiring and motivating millions of Americans to live healthier lives."

Interested applicants for The Biggest Loser 6 must be at least 18 years of age and legal U.S. residents.  Additional information is available via NBC's website.

The Biggest Loser sixth-season casting call dates and locations are:

February 16

Boston, MA
Felt
533 Washington Street
Boston, MA  02111
10AM - 6PM

Dallas, TX
Uptown Bar & Grill
2523 McKinney Avenue
Dallas, TX  75201
10AM - 6PM

Chicago, IL
Chicago Home Fitness
1555 N. Halsted
Chicago, IL  60622
10AM - 6PM

Atlanta, GA
Wild Bills
2075 Market Street
Duluth, GA  30096
10AM - 6PM

February 23

New York City, NY
NBC Experience Store
30 Rockefeller Plaza
New York, NY 10112
10AM- 6PM

Nashville, TN
The Wild Horse Saloon
120 2nd Avenue N
Nashville, TN  37201
10AM - 6PM

Oklahoma City, OK
Bricktown Brewery
1 N. Oklahoma Avenue
Oklahoma City, OK  73104
10AM - 6PM

Miami, FL
Festival Flea Market Mall
2900 West Sample Road
Pompano Beach, FL  33073
10AM - 5PM

March 1

Columbus, OH
Buckeye Hall of Fame Cafe
1421 Olentangy River Road
Columbus, OH  43212
10AM - 6PM

Suffolk, VA
Suffolk Family YMCA
2769 Godwin Blvd.
Suffolk, VA  23434
10AM - 6PM

March 8

Las Vegas, NV
Location TBA

Mesa, AZ
Superstitions Spring Mall
6555 E. Southern Avenue
Mesa, AZ  85206
10AM - 6PM

Los Angeles, CA
Location TBA
About The Author: Christopher Rocchio
Christopher Rocchio is an entertainment reporter for Reality TV World and has covered the reality TV genre for several years.