Eminem & Rihanna (Courtesy of VEVO)

Miranda Lambert & Carrie Underwood performs during the 2014 CMA Festival at LP Field on June 6, 2014 in Nashville, Tennessee. (Photo by C Flanigan/FilmMagic)

Miranda Lambert performs during the 2014 CMA Festival at LP Field on June 6, 2014 in Nashville, Tennessee. (Photo by C Flanigan/FilmMagic)

Miranda Lambert performs during the 2014 CMA Festival at LP Field on June 6, 2014 in Nashville, Tennessee. (Photo by C Flanigan/FilmMagic)

Carrie Underwood performs during the 2014 CMA Festival at LP Field on June 6, 2014 in Nashville, Tennessee. (Photo by C Flanigan/FilmMagic)

Tim McGraw and wife Faith Hill kiss onstage during the 2014 CMA Festival at LP Field on June 5, 2014 in Nashville, Tennessee. (Photo by C Flanigan/FilmMagic)

Tim McGraw and wife Faith Hill kiss onstage during the 2014 CMA Festival at LP Field on June 5, 2014 in Nashville, Tennessee. (Photo by C Flanigan/FilmMagic)

Tim McGraw and wife Faith Hill kiss onstage during the 2014 CMA Festival at LP Field on June 5, 2014 in Nashville, Tennessee. (Photo by C Flanigan/FilmMagic)

Tim McGraw and wife Faith Hill kiss onstage during the 2014 CMA Festival at LP Field on June 5, 2014 in Nashville, Tennessee. (Photo by C Flanigan/FilmMagic)

Tim McGraw performs during the 2014 CMA Festival at LP Field on June 5, 2014 in Nashville, Tennessee. (Photo by C Flanigan/FilmMagic)

Tim McGraw performs during the 2014 CMA Festival at LP Field on June 5, 2014 in Nashville, Tennessee. (Photo by C Flanigan/FilmMagic)

Luke Bryan performs during the 2014 CMA Festival at LP Field on June 5, 2014 in Nashville, Tennessee. (Photo by C Flanigan/FilmMagic)

Luke Bryan performs during the 2014 CMA Festival at LP Field on June 5, 2014 in Nashville, Tennessee. (Photo by C Flanigan/FilmMagic)

Brian Kelley and Tyler Hubbard of Florida Georgia Line perform at the 2014 CMA Festival on June 7, 2014 in Nashville, Tennessee. (Photo by Larry Busacca/Getty Images)

Tyler Hubbard of Florida Georgia Line perform at the 2014 CMA Festival on June 7, 2014 in Nashville, Tennessee. (Photo by Larry Busacca/Getty Images)

Tyler Hubbard of Florida Georgia Line perform at the 2014 CMA Festival on June 7, 2014 in Nashville, Tennessee. (Photo by Larry Busacca/Getty Images)

Blake Shelton performs during the 2014 CMA Festival at LP Field on June 6, 2014 in Nashville, Tennessee. (Photo by C Flanigan/FilmMagic)

Hillary Scott of Lady Antebellum performs onstage at the 2014 CMA Festival on June 8, 2014 in Nashville, Tennessee. (Photo by Larry Busacca/Getty Images)

Charles Kelley, Hillary Scott and Dave Haywood of Lady Antebellum perform onstage at the 2014 CMA Festival on June 8, 2014 in Nashville, Tennessee. (Photo by Larry Busacca/Getty Images)

Hillary Scott of Lady Antebellum performs onstage at the 2014 CMA Festival on June 8, 2014 in Nashville, Tennessee. (Photo by Larry Busacca/Getty Images)

Kellie Pickler performs onstage at the 2014 CMA Festival on June 6, 2014 in Nashville, Tennessee. (Photo by Christopher Polk/Getty Images)

Kellie Pickler performs onstage at the 2014 CMA Festival on June 6, 2014 in Nashville, Tennessee. (Photo by Christopher Polk/Getty Images)

Jamie Lynn Spears performs on the Bud Light Stage at the Bridestone Arena at the 2014 CMA Festival on June 8, 2014 in Nashville, Tennessee. (Photo by Frederick Breedon/WireImage)

Keith Urban performs during the 2014 CMA Festival at LP Field on June 7, 2014 in Nashville, Tennessee. (Photo by C Flanigan/FilmMagic)

Keith Urban performs during the 2014 CMA Festival at LP Field on June 7, 2014 in Nashville, Tennessee. (Photo by C Flanigan/FilmMagic)

Jason Aldean performs during the 2014 CMA Festival at LP Field on June 6, 2014 in Nashville, Tennessee. (Photo by C Flanigan/FilmMagic)

Brad Paisley performs onstage at the 2014 CMA Festival on June 8, 2014 in Nashville, Tennessee. (Photo by Larry Busacca/Getty Images)

Neil Perry, Kimberly Perry, and Reid Perry of The Band Perry perform at LP Field at the 2014 CMA Festival on June 6, 2014 in Nashville, Tennessee. (Photo by Frederick Breedon IV/WireImage)

Kimberly Perry of The Band Perry performs during the 2014 CMA Festival on June 6, 2014 in Nashville, Tennessee. (Photo by Larry Busacca/Getty Images)

Kimberly Perry of The Band Perry performs during the 2014 CMA Festival on June 6, 2014 in Nashville, Tennessee. (Photo by Larry Busacca/Getty Images)

Hunter Hayes performs during the 2014 CMA Festival at LP Field on June 6, 2014 in Nashville, Tennessee. (Photo by C Flanigan/FilmMagic)

Hunter Hayes performs during the 2014 CMA Festival at LP Field on June 6, 2014 in Nashville, Tennessee. (Photo by C Flanigan/FilmMagic)

Hunter Hayes performs during the 2014 CMA Festival at LP Field on June 6, 2014 in Nashville, Tennessee. (Photo by C Flanigan/FilmMagic)

Cassadee Pope performs during the 2014 CMA Festival at LP Field on June 6, 2014 in Nashville, Tennessee. (Photo by C Flanigan/FilmMagic)

Danielle Bradbery performs during the 2014 CMA Festival on June 6, 2014 in Nashville, Tennessee. (Photo by Larry Busacca/Getty Images)

Brantley Gilbert performs during the 2014 CMA Festival at LP Field on June 5, 2014 in Nashville, Tennessee. (Photo by C Flanigan/FilmMagic)

Eric Church performs during the 2014 CMA Festival on June 6, 2014 in Nashville, Tennessee. (Photo by Larry Busacca/Getty Images)

Actor Maddox Jolie-Pitt attends the World Premiere of Disney's 'Maleficent' at the El Capitan Theatre on May 28, 2014 in Hollywood, California. (Photo by Jason Merritt/Entertainment/Getty Images)

Actor Maddox Jolie-Pitt attends the World Premiere of Disney's 'Maleficent' at the El Capitan Theatre on May 28, 2014 in Hollywood, California. (Photo by Jason Merritt/Entertainment/Getty Images)

Maddox Jolie-Pitt attends a private reception as costumes and props from Disney's 'Maleficent' are exhibited in support of Great Ormond Street Hospital at Kensington Palace on May 8, 2014 in London, England. (Photo by Ben Pruchnie/WireImage)

Brad Pitt & Angelina Jolie (Getty)

Maddox Jolie-Pitt arrives at The Board Of Governors Of The Academy Of Motion Picture Arts And Sciences' Governor Awards at Dolby Theatre on November 16, 2013 in Hollywood, California. (Photo by Jon Kopaloff/FilmMagic)

Brad Pitt and Maddox Jolie-Pitt attend the World Premiere of 'World War Z' at The Empire Cinema on June 2, 2013 in London, England. (Photo by Stuart C. Wilson/Entertainment/Getty Images for Paramount Pictures International)

Angelina Jolie and her kids Maddox and Zahara arriving on a flight at LAX airport in Los Angeles, California on March 29, 2014 (FameFlyNet)

Angelina Jolie and her kids, Shiloh, Maddox, Pax, Zahara, Vivienne, and Knox arriving on a flight at the Sydney Airport in Sydney, Australia on September 5, 2013 (FameFlyNet)

Angelina Jolie and her kids, Shiloh, Maddox, Pax, Zahara, Vivienne, and Knox arriving on a flight at the Sydney Airport in Sydney, Australia on September 5, 2013 (FameFlyNet)

Angelina Jolie and son Maddox Jolie-Pitt arriving on a flight at LAX airport in Los Angeles, California on August 15, 2013 (FameFlyNet)

Angelina Jolie and son Maddox Jolie-Pitt arriving on a flight at LAX airport in Los Angeles, California on August 15, 2013 (FameFlyNet)

Brad Pitt and Angelina Jolie arrive at LAX with son Maddox from London on February 17, 2014 (Pacific Coast New)