Christina Aguilera is Shrinking Before Our Eyes

(Reuters)

Performing "Genie In A Bottle" in 1999. PHOTOS: The 5 Most Awkward Moments At Awards Shows (Reuters)

Arriving at the red carpet in 2000. (Reuters)

Entering House of Blues in 2012. (Reuters)

Attending the screening in 2013. (Reuters)

Performing with Pitbull in Los Angeles. (Reuters)

Celebrating in New York City. (Reuters)

Performing with Pitbull at the MGM Grand Garden Arena in Las Vegas. (Reuters)

Participating during the NBC sessions at the Television Critics Association summer press tour in Beverly Hills. (Reuters)

Entering Radio City Music Hall in 2002. (Associated Press)

Arriving at the taping in 2006. (Reuters)

Attending an event in 2008. (Associated Press)

Greeting photographers in 2010. (Associated Press)

Performing at the Millennium Stadium in 2011. (Reuters)

Waving to fans in 2012. (Associated Press)

Hitting a red carpet in 2012. PHOTOS: The Most Scandolous Looks At The 2013 American Music Awards (Reuters)

Performing in 2012. (Reuters)