Shania Twain over the years

Shania Twain performs for her fans at the Mercury Records show during Fan Fair at the Tennessee State Fair June 6, 1995.

Shania Twain performs for her fans at the Mercury Records show during Fan Fair at the Tennessee State Fair June 6, 1995.

Shania Twain performs for her fans at the Mercury Records show during Fan Fair at the Tennessee State Fair June 6, 1995.

Shania Twain, right, answers questions from the international media covering the annual Fan Fair at the Tennessee State Fairgrounds June 7, 1995.

Shania Twain, right, answers questions from the international media covering the annual Fan Fair at the Tennessee State Fairgrounds June 7, 1995.

Shania Twain performs for the Fan Fair audience during the Mercury Records show at the Tennessee State Fairgrounds June 11, 1996.

Shania Twain sings during rehearsal Sept. 30, 1996, in preparation for the upcoming 30th annual CMA Awards show at the Grand Ole Opry House.

Shania Twain, left, gets a ride after arriving for the 30th annual CMA awards show at the Grand Ole Opry House Oct. 2, 1996.

Shania Twain walks the red carpet for the 30th annual CMA Awards show at the Grand Ole Opry House Oct. 2, 1996.

Shania Twain waves to the audience after performing one of her songs during the 30th annual CMA Awards show at the Grand Ole Opry House Oct. 2, 1996.

Shania Twain performs at the Sudbury Community Arena in Ontario, Canada, May 29, 1998.

Shania Twain performs at the Sudbury Community Arena in Ontario, Canada, May 29, 1998.

Shania Twain sings "Honey I'm Home" during the annual CMA Awards show at the Grand Ole Opry House Sept. 23, 1998.

Shania Twain performs before a packed house at the Nashville Arena Sept. 25, 1998.

Shania Twain performs before a packed house at the Nashville Arena Sept. 25, 1998.

Shania Twain performs at the First American Music Center for an enthusiastic crowd in Nashville June 2, 1999.

Shania Twain, center, is greeted by Frances Preston, left, Ppresident and CEO of BMI, and Roger Sovine, VP of BMI Nashville, during the BMI Awards and dinner Sept. 21, 1999.

Shania Twain walks the red carpet for the 1999 CMA Awards show at the Grand Old Opry Sept. 22, 1999.

Shania Twain walks the red carpet for the 1999 CMA Awards show at the Grand Old Opry Sept. 22, 1999.

Shania Twain performs during the 1999 CMA Awards show at the Grand Old Opry House Sept. 22, 1999.

Shania Twain performs during the 1999 CMA Awards show at the Grand Old Opry House Sept. 22, 1999.

Shania Twain performs during the 1999 CMA Awards show at the Grand Old Opry House Sept. 22, 1999.

Shania Twain, left, reacts after presenter Vince Gill misses a line during the CMA Awards show at the Grand Ole Opry House. Gill said it was difficult to stand next to Twain and get the lines right. She received the International Artist Award.

A stunned Shania Twain, right, receives the Entertainer of the Year award from presenter Reba McEntire during the CMA Awards show at the Grand Ole Opry House Sept. 22, 1999.

A tearful Shania Twain speaks to the audience after winning the Entertainer of the Year award during the CMA Awards show at the Grand Ole Opry House Sept. 22, 1999.

Shania Twain speaks to the media backstage about winning the Entertainer of the Year award during the CMA Awards show at the Grand Old Opry House Sept. 22, 1999.

Shania Twain, dazzling in a Isabell Kristensen-designed dress, walks the red carpet for the CMA Awards show at the Grand Ole Opry House Oct. 4, 2000.

Shania Twain performs "I'm Gonna Getcha Good!" during the 36th annual CMA Awards show at the Grand Ole Opry House Nov 6, 2002.

Shania Twain performs "I'm Gonna Getcha Good!" during the 36th annual CMA Awards show at the Grand Ole Opry House Nov 6, 2002.

Shania Twain answers questions from the media backstage during the CMA Awards show at the Grand Ole Opry House Nov. 6, 2002.

Shania Twain accepts an award at the CMT Flameworthy 2003 Video Music Awards show at the Gaylord Entertainment Center April 7, 2003.

Shania Twain performs during the CMT Flameworthy 2003 Video Music Awards at the Gaylord Entertainment Center April 7, 2003.

Shania Twain performs during the CMA Awards show at the Grand Ole Opry House Nov. 5, 2003.

Shania Twain performs during the CMA Awards show at the Grand Ole Opry House Nov. 5, 2003.

Shania Twain talks to reporters backstage during the 37th annual CMA Awards show at the Grand Ole Opry House Nov. 5, 2003.

Shania Twain accepts her award for Female Video of the Year during the 2004 CMT Flame Worthy Awards April 21, 2004, at the Gaylord Entertainment Center.

Shania Twain walks through fans as she enters the stage for the "Good Morning America" Nashville Block Party Nov. 5, 2004.

Shania Twain performs "Man! I Feel Like A Woman" during "Good Morning America's" Nashville Block Party Nov. 5, 2004.

Shania Twain performs "Man! I Feel Like A Woman" during "Good Morning America's" Nashville Block Party Nov. 5, 2004.

Shania Twain signs autographs for her fans during a break between songs at her concert for "Good Morning America's" Nashville Block Party Nov. 5, 2004.

Shania Twain, left, and Billy Currington sing their duet, "Party for Two," during "Good Morning America's" Nashville Block Party on Lower Broadway Nov. 5, 2004.

Shania Twain walks on the red carpet for the 38th annual CMA Awards show at the Grand Ole Opry House Nov. 9, 2004.

Shania Twain, left, and Billy Currington perform their "Party For Two" duet during the 38th annual CMA Awards show at the Grand Ole Opry House Nov. 9, 2004.

Shania Twain, left, and Billy Currington perform their "Party For Two" duet during the 38th annual CMA Awards show at the Grand Ole Opry House Nov. 9, 2004.

Shania Twain arrives on the red carpet for the premiere of "Walk the Line," a movie about Johnny Cash's life. The premiere was held at the Beacon Theater in New York City Nov. 13, 2005.

Shania Twain walks the red carpet before the 39th annual CMA Awards show at Madison Square Garden in New York Nov. 15, 2005.

Shania Twain walks out to present the Entertainer of the Year award during the 42nd annual CMA Awards show at the Sommet Center Nov. 12th, 2008.

Kenny Chesney accepts the Entertainer of the Year award as presenter Shania Twain looks on during the 42nd annual CMA Awards show Nov. 12, 2008 at the Sommet Center.

Shania Twain walks the red carpet for the CMT Music Awards show June 8, 2011, at Bridgestone Arena.

Shania Twain, left, congratulates Justin Bieber and Gary LeVoux for winning Best Collaborative Video Of The Year for "That Should Be Me" at the CMT Music Awards June 8, 2011, at Bridgestone Arena.

Shania Twain presents the Male Video of the Year to Blake Shelton during the CMT Music Awards show June 8, 2011, at Bridgestone Arena.

Jesse Endsley, 19, gets a guitar signed by Shania Twain, right, during a book signing for her new book at the 2011 CMA Music Festival June 10, 2011.

Shania Twain introduces Sugarland during the CMA Music Festival June 10, 2011, at LP Field.