Selena Gomez arrives at the Billboard Music Awards 2013 at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, NV.

Selena Gomez arrives at the Radio Disney Music Awards 2013 at the Nokia Theater on April 27, 2013 in Los Angeles, CA.

Selena Gomez arrives to the MTV Movie Awards 2013 at Sony Studios in Culver City, CA on April 14, 2013.

Selena Gomez at the British Fashion Council’s “London Show Rooms LA” at Thompson Hotel in Beverly Hills, CA on April 9, 2013.

Selena Gomez at Nickelodeon’s 26th Annual Kids’ Choice Awards at the Galen Centre in Los Angeles, CA on March 23, 2013.

Selena Gomez arrives at the “Spring Breakers” Premiere at the Arclight, Hollywood on March 14, 2013 in Los Angeles, CA.

Selena Gomez at the 2012 Nickelodeon Kids’ Choice Awards at Galen Center in Los Angeles, CA on March 31, 2012.

Miley Cyrus in the press room at the 2013 Teen Choice Awards at Gibson Amphitheatre in Los Angeles, California on August 11, 2013.

Miley Cyrus arrives at the “Paranoia” Los Angeles Premiere at the Directors Guild of America on August 8, 2013 in Los Angeles, CA.

Miley Cyrus arrives at the Billboard Music Awards 2013 at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, NV.