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EXCLUSIVE VIDEO: Wango Tango Stars Have Justin Bieber Fever!

Rock n’ Roll royalty came out for the annual KIIS-FM Wango Tango concert in L.A. Saturday night. RadarOnline.com was there for all the action – from the star-packed Red Carpet to backstage.

PHOTOS: Stars Come Out For Wango Tango

Ludacris stopped by and told us he thinks Justin “is a young, cool kid.”

Adam Lambert showed off his rhinestones – on his face – and Kelly Rowland told us what music she was rockin’ to.

PHOTOS: Adam Lambert Hangs With The Cast Of GLEE

Last year’s breakout star, Jason Derulo, sang his new hit single for us and told us he couldn’t wait to see Ke$ha perform.

Sexy stars from MTV’s The Hills Audrina Patridge and Ryan Cabrera shared music secrets with us but all the star power dimmed when 16 year old Justin Bieber walked the R/C.

PHOTOS: Audrina Patridge Shows Off Her Bikini Bod

Hot off his new single “Baby”, the singing phenomenon even had radio host Ryan Seacrest in awe!