Justin Bieber, Bruno Mars joining Selena Gomez at Madison Square Garden

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The lineup for Z100's Jingle Ball is now completely announced, and it just keeps getting better and better. Going into Monday's big announcement, we knew that Katy Perry, Paramore, and "Wizards of Waverly Place" star Selena Gomez (with her band The Scene) were all signed on as performers.
Now, we have the complete list of attendees:

• Justin Bieber: A teen star sure to sell out tickets fast.
• Bruno Mars: He loves you "Just the Way You Are."
• Michael Buble: He dressed up as Bieber for a music video ... this could be awkward.
• B.o.B: He collaborated with Bruno on "Nothin' On You"
• Tiao Cruz: He's only going to "Break Your Heart."
• Travie McCoy: He really wants to be a "Billionaire"
• Enrique Iglesias: The guy returned to form this year with "I Like It"