Are you ready for one seriously epic concert? The KIIS FM Wango Tango lineup has arrived as well as info on who will be guest hosting with Ryan Seacrest on May 12th.

Since judging didn’t really work out too well for Britney Spears on The X-Factor, looks like she’ll give hosting a try, taking the stage with Ryan for the big show. It won’t be her first rodeo, though, since they paired up for the 2011 concert previously.

Related Article: Demi Lovato Admits Her X-Factor Mistakes

Now, time for the lineup! A wide array of music genres will be represented with acts like Bruno Mars, Maroon 5, Miguel, Demi Lovato, Flo Rida, Will.i.am, Fall Out Boy, Afrojack, Icona Pop, Jason Derulo, Krewella, Emeli Sande, and Ariana Grande performing. See? Told you it was epic.

Another big name will be on hand and you may have heard of him -– Justin Bieber. Does that name ring a bell? While he won’t be performing, he’ll introduce Carly Rae Jepsen for her set. The Biebs on stage for like, 3 minutes or so is enough incentive for us to go!

Wango Tango 2013 takes place on May 12th at the Home Depot Center in Carson, CA. Tickets go on sale at 10 AM on April 6th.

Which act are you most stoked to see take the stage?