Miley Cyrus onstage during the 2013 MTV Video Music Awards at the Barclay Center on Sunday, Aug. 25, 2013 in New York. (Photo by Frank Micelotta/Invision/AP)

Robin Thicke and Miley Cyrus perform "Blurred Lines" at the MTV Video Music Awards on Sunday, Aug. 25, 2013, at the Barclays Center in the Brooklyn borough of New York. (Photo by Charles Sykes/Invision/AP)

Robin Thicke, left, and Miley Cyrus perform "Blurred Lines" at the MTV Video Music Awards on Sunday, Aug. 25, 2013, at the Barclays Center in the Brooklyn borough of New York. (Photo by Charles Sykes/Invision/AP)

Miley Cyrus performs at the MTV Video Music Awards on Sunday, Aug. 25, 2013, at the Barclays Center in the Brooklyn borough of New York. (Photo by Charles Sykes/Invision/AP)

Miley Cyrus performs at the MTV Video Music Awards on Sunday, Aug. 25, 2013, at the Barclays Center in the Brooklyn borough of New York. (Photo by Charles Sykes/Invision/AP)

Miley Cyrus performs at the MTV Video Music Awards at Barclays Center on Sunday, Aug. 25, 2013, in the Brooklyn borough of New York. (Photo by John Shearer/Invision for MTV/AP Images)

Robin Thicke and Miley Cyrus perform at the MTV Video Music Awards on Sunday, Aug. 25, 2013, at the Barclays Center in the Brooklyn borough of New York. (Photo by Scott Gries/Invision/AP)

Lady Gaga onstage during the 2013 MTV Video Music Awards at the Barclay Center on Sunday, Aug. 25, 2013 in New York. (Photo by Frank Micelotta/Invision/AP)

Lady Gaga onstage during the 2013 MTV Video Music Awards at the Barclay Center on Sunday, Aug. 25, 2013 in New York. (Photo by Frank Micelotta/Invision/AP)

NEW YORK, NY - AUGUST 09: Flo Rida at NBC'S Today Show Toyota Concert Series featuring a performance by Flo Rida on August 9, 2013 in New York City. Credit: RW/MediaPunch Inc. Credit: MediaPunch/face to face - Germany, Austria, Switzerland, Eastern Europe, Australia, UK, USA, Taiwan, Singapore, China, Malaysia, Thailand, Sweden, Estonia, Latvia and Lithuania rights only - fot. Face to Face/REPORTER

NEW YORK, NY - AUGUST 09: Flo Rida at NBC'S Today Show Toyota Concert Series featuring a performance by Flo Rida on August 9, 2013 in New York City. Credit: RW/MediaPunch Inc. Credit: MediaPunch/face to face - Germany, Austria, Switzerland, Eastern Europe, Australia, UK, USA, Taiwan, Singapore, China, Malaysia, Thailand, Sweden, Estonia, Latvia and Lithuania rights only - fot. Face to Face/REPORTER

Rihanna en concert a Bilbao, premier concert de sa tournee europeenne, le 26 mai 2013. Rihanna performs at Bilbao Exhibition Center as the first concert of her 2013 European Tour - Bilbao-May 27, 2013

MAVRIXONLINE.COM - Rihanna performs live at Twickenham Stadium as part of her "Diamonds World Tour" in Twickenham Middlesex, UK. 16th June 2013. Byline, credit, TV usage, web usage or linkback must read MAVRIXONLINE.COM.3 Failure to byline correctly will incur double the agreed fee. Tel: +1 305 542 9275.

Rihanna en concert a Bilbao, premier concert de sa tournee europeenne, le 26 mai 2013. Rihanna performs at Bilbao Exhibition Center as the first concert of her 2013 European Tour - Bilbao-May 27, 2013

JENNIFER LOPEZ @ SOUND OF CHANGE CONCERT- CHIME FOR CHANGE -TWICKENHAM STADIUM, TWICKENHAM , LONDON, U.K.- 1/6/2013 PHOTOGRAPH BY: ANGELA LUBRANO / LIVEPIX_ DALLE

IGGY AZALEA @ SOUND OF CHANGE CONCERT- CHIME FOR CHANGE -TWICKENHAM STADIUM, TWICKENHAM , LONDON, U.K.- 1/6/2013 PHOTOGRAPH BY: ANGELA LUBRANO / LIVEPIX- DALLE

IGGY AZALEA @ SOUND OF CHANGE CONCERT- CHIME FOR CHANGE -TWICKENHAM STADIUM, TWICKENHAM , LONDON, U.K.- 1/6/2013 PHOTOGRAPH BY: ANGELA LUBRANO / LIVEPIX- DALLE

MAVRIXONLINE.COM - Pink performs live in concert at the Amway Center. Orlando, FL. 24th February 2013. Byline, credit, TV usage, web usage or linkback must read MAVRIXONLINE.COM. Failure to byline correctly will incur double the agreed fee. Tel: +1 305 542 9275.

MAVRIXONLINE.COM - Pink performs live in concert at the Amway Center. Orlando, FL. 24th February 2013. Byline, credit, TV usage, web usage or linkback must read MAVRIXONLINE.COM. Failure to byline correctly will incur double the agreed fee. Tel: +1 305 542 9275.

Fans cheers as US pop icon Madonna performs on stage during her first ever concert in the Gulf as part of her MDNA world tour at Abu Dhabi's Yas Island Stadium on June 3, 2012. An estimated 25,000 fans cheered and screamed as the Material Girl finally appeared on stage more than two hours late, wearing a skin-tight black outfit from her "Girl Gone Wild" album. AFP PHOTO/MARWAN NAAMANI