If you had plans for May 19, do yourself a favor and cancel them immediately. Oh, you're getting married? Not anymore! Taylor Swift, Justin Bieber, Bruno Mars and Miguel will all perform at the 2013 Billboard Music Awards.

Seeing as Billboard measures the selling power of music's biggest acts, it makes total sense that four of pop's biggest stars are on the bill to perform. But no Justin Timberlake? C'mon! He had the best selling album of 2013 to date!

Prince will also perform during the award show, in addition to being honored with the Billboard Icon Award, so make sure to set those DVRs because we all know the Purple One delivers unreal performances. We'd love to see Bruno or Miguel sync up with Prince on this performance, but that man can surely rock the house on his own.

Justin, Taylor, Bruno and Miguel are also all up for the Milestone Award along with Pitbull and the Band Perry. So, what is this newfangled honor? Fans can vote for their favorite star online and then enter a contest to present this award at the show with Cee Lo Green. A trip to Vegas and getting on national TV? Where do we sign... err... we mean vote?!

This is shaping up to be a can't-miss award show!

 Watch the Bruno Mars 'When I Was Your Man' Video