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The music video sees the 'Replay' singer tagging along the Gym Class Heroes star in a quest to find the right one.
The rocker had announced via Twitter before he sprayed graffiti on the remains of the Berlin Wall on October 17.
The ex-boyfriend is not bitter about Perry's weekend marriage to Russell Brand, saying they didn't keep in touch that much since their split last year.
The Fueled by Ramen artist enjoys a night sightseeing in the Chinatown in this newly-debuted music video.
Those three artists battle against each other to win the top honor, Artist of the Year, along with two other competitors Ke$ha and Lady GaGa.
Hearing that his ex-girlfriend wrote 'Circle the Drain' about him, the rapper said he's glad that Perry 'finally has a song with some substance'.
The singer is jumping around with a bunch of friends in a house, playing with a mattress and skate-boarding all night long.
The other newly-announced stars who will either perform or present awards are Travis McCoy, Jason Derulo, Robyn, Jesse Eisenberg and Andrew Garfield.
Selena, who landed Choice Red Carpet Fashion Icon - Female nom, wears a white BCBG, while Kim made an eye-grabbing appearance in a black skintight bandage dress at the August 8 event.
Michael Buckley from 'What the Buck Show' would be interviewing various stars from Robert Pattinson to 'Glee' actress Jane Lynch.
Other fresh news from the TCAs are that Cory Monteith, Chris Colfer, Kevin McHale and Mark Salling will be co-hosting; and Robert Pattinson as well as Ashley Greene are set to attend.
B.o.B adds two more nods along with Lady GaGa, Ke$ha and Katy Perry, but it is him and Drake who lead the overall music nominations list with six nods.
Ruling the chart for a second consecutive week, the lead single of Perry's upcoming album once again bans Usher's 'OMG' from taking the coveted spot.
The Gym Class Heroes frontman will join Rihanna and Ke$ha on the road beginning July 2 at White River Amphitheatre in Auburn, WA.
Starting with 'sad and somber' songs, the Gym Class Heroes frontman comes out with a finished product which has a very different mood to make the summertime more cheerful.