Justin Bieber and Taylor Swift are two of the biggest names in music right now, and they’ve both got a lot of stuff going on. The Biebs is currently selling out stadiums on his “Believe” tour, while Taylor just released her Red, her fourth studio album yesterday, with a tour also in the works. But both stars will take breaks from doing their own thing to come together to headline at this year’s annual Jingle Ball at the Nokia Theatre in Los Angeles.

The event is held every year, but this will be the first time ever that it’s spread out over two days — both filled with a ton of great music. Swift will take the stage on the first night, December 1 with Ne-Yo, Ellie Goulding, One Republic, and Wonder Girls featuring Akon also performing. In addition to that, an announcement was also made that a “surprise superstar band” will also be there to play along, but you’ll have to go if you want to find out who it is.

After that though, there’s still an entire night of music to be had as Justin Bieber headlines the second night with Flo Rida, The Wanted, Ke$ha, fun., Afrojack, Owl City, Zedd and Psy also performing.

Both Swift’s and Bieber’s current projects have already been huge successes. Swift’s first single release off Red was “We are Never Ever Getting Back Together,” has had the most downloads for any female artist ever; while Bieber’s Believe album had the biggest debut sales week of any album release for 2012 when it came out in June.

If you haven’t yet been to the Jingle Ball in L.A., this is a great year to make your own debut appearance!