The title of Artist of the Year is a big honor for any singer at any point in his or her career. The upcoming American Music Awards will bestow this title on one hard-working star who has pushed the limits in 2013. Macklemore & Ryan Lewis, Bruno Mars, Rihanna, Taylor Swift and Justin Timberlake are all nominated for the award -- who do you think should take it home?

This has been a huge year for Macklemore and Ryan Lewis. The duo populated the charts with hits like 'Thrift Shop' and 'Can't Hold Us,' while wowing millions with their performance of 'Same Love' at the MTV VMAs in August. Not bad for a new artist!

Bruno Mars continues to keep us dancing with his upbeat, yet seductive tracks. The singer proves that he's a full-on entertainer with his fierce performances and ability to one-up himself with each hit.

Rihanna started out 2013 strong with her breathtaking performance of 'Stay' at the Grammys -- and she hasn't slowed down since! Embarking on a world tour and collaborating with Eminem are just two of the other things she's accomplished this year.

Riding the wave of her smash 2012 release, 'Red,' Taylor Swift had a major year! She hit the road with Ed Sheeran, collecting endless awards along the way. T. Swift capped off the year by performing at the Victoria's Secret Fashion Show.

What can you say about the man who released not one, but two hit albums this year? Justin Timberlake is a force to be reckoned with! JT teamed up with fellow superstar Jay Z, producing a hit song, 'Suit and Tie.'

Who should win the American Music Award for Artist of the Year? You can vote once an hour until the polls close on Nov. 24 at 7:59PM ET.