Oakland Raiders Raiderettes cheerleader during an NFL regular season game against the Kansas City Chiefs on Thursday, Nov. 20, 2014 in Oakland, Calif. (Ric Tapia/NFL)

The Oakland Raiders cheerleaders flip their hair as they perform a dance routine before the NFL week 12 regular season football game against the Kansas City Chiefs on Thursday, Nov. 20, 2014 in Oakland, Calif. (AP Photo/Paul Spinelli)

Oakland Raiders cheerleaders perform during the second half of an NFL football game against the San Diego Chargers in Oakland, Calif., Sunday, Oct. 12, 2014. (AP Photo/Marcio Jose Sanchez)

The Raiderettes cheerleaders perform during an NFL football game between the Oakland Raiders and Miami Dolphins at Wembley Stadium on Sunday, Sept. 28, 2014 in London, England. (Ben Liebenberg/NFL)

Oakland Raiders Raiderette cheerleader during an NFL regular season game against the Denver Broncos on Sunday, Nov. 9, 2014 in Oakland, Calif. (Ric Tapia/NFL)

Oakland Raiders cheerleaders perform during the second quarter of an NFL football game between the Oakland Raiders and the San Francisco 49ers in Oakland, Calif., Sunday, Dec. 7, 2014. (AP Photo/Marcio Jose Sanchez)

An Oakland Raiders cheerleader performs during the first half of an NFL football game between the Oakland Raiders and the Buffalo Bills in Oakland, Calif., Sunday, Dec. 21, 2014. (AP Photo/Marcio Jose Sanchez)

Oakland Raiders Raiderettes cheerleaders during an NFL regular season game against the Buffalo Bills on Sunday, Dec. 21, 2014 in Oakland, Calif. (Ric Tapia/NFL)

An Oakland Raiders cheerleader performs during an NFL game against the Denver Broncos on Sunday, Nov. 9, 2014, in Oakland Calif. (AP Photo/Greg Trott)

Oakland Raiders Raiderette cheerleader during an NFL regular season game against the Buffalo Bills on Sunday, Dec. 21, 2014 in Oakland, Calif. (Ric Tapia/NFL)

An Oakland Raiders cheerleader does a dance routine during the 2014 NFL preseason football game against the Detroit Lions on Friday, Aug. 15, 2014 in Oakland, Calif.(AP Photo/Paul Spinelli)

Oakland Raiders cheerleaders during an NFL football game against the Houston Texans on Sunday, September 14, 2014 in Oakland Calif. (AP Photo/Peter Read Miller)

Oakland Raiders cheerleader Raiderette during an NFL preseason game against the Detroit Lions on Friday, Aug. 15, 2014 in Oakland, Calif. (Ric Tapia/NFL)

An Oakland Raiders cheerleader performs during an NFL football game against the Kansas City Chiefs on Thursday, Nov. 20, 2014, in Oakland, Calif. (AP Photo/Greg Trott)

Cheerleaders perform during the first half of an NFL football game between the Miami Dolphins and the Oakland Raiders, Sunday, Sept. 28, 2014, at Wembley Stadium in London. (AP Photo/Lefteris Pitarakis)

A member of the Raiderettes cheerleaders performs during an NFL football game between the Oakland Raiders and Miami Dolphins at Wembley Stadium on Sunday, Sept. 28, 2014 in London, England. Miami won 38-14. (Ben Liebenberg/NFL)

Oakland Raiders cheerleaders perform with pink pom pons for breast cancer awareness before an NFL football game against the San Diego Chargers in Oakland, Calif., Sunday, Oct. 12, 2014. (AP Photo/Marcio Jose Sanchez)

Oakland Raiders cheerleaders perform in the first quarter of an NFL football game between the Oakland Raiders and the Houston Texans Sunday, Sept. 14, 2014, in Oakland, Calif. (AP Photo/Beck Diefenbach)

Oakland Raiders cheerleaders during an NFL football game against the Oakland Raiders on Sunday, September 14, 2014 in Oakland Calif. The Texans won the game 30 to 14. (AP Photo/Peter Read Miller)

Oakland Raiderettes Erica cheesr after an NFL game against the San Francisco 49ers on Sunday, December 7, 2014 at O.co Coliseum. The Raiders defeated the 49ers 24-13. (AP Photo/Kevin Terrell)

An Oakland Raiders cheerleader performs in the second quarter of an NFL football game between the Oakland Raiders and the Houston Texans Sunday, Sept. 14, 2014, in Oakland, Calif. (AP Photo/Ben Margot)

A member of the Raiderettes cheerleaders performs during an NFL football game between the Oakland Raiders and Miami Dolphins at Wembley Stadium on Sunday, Sept. 28, 2014 in London, England. Miami won 38-14. (Ben Liebenberg/NFL)