The star-studded show at NYC's Madison Square Garden also included performances from Robin Thicke, Pitbull, Enrique Iglesias, Fall Out Boy, Macklemore & Ryan Lewis, Paramore, Fifth Harmony and Jason Derulo.
We found out that a few of them (including Ryan Seacrest) share the same favorite holiday Christmas music.
Ryan was excited to partner with the concert sponsors--one dollar of each ticket sold benefited The Ryan Seacrest Foundation, which is dedicated to inspiring young people through entertainment education.
Jason kicked off the night performing "Marry Me," while his girlfriend Jordan Sparks looked on with her support. Next Ariana performed, "Last Christmas," followed by Selena belting out "Come and Get It." Austin sang "Just a Friend" right before Macklemore & Ryan Lewis killed it with their song "Same Love." Twerking on Santa, Miley Cyrus closed the show with "Wrecking Ball" and "We Can't Stop."
Check out the video above to find out who's been naughty or nice and to hear their fave holiday songs (Austin even sings his).