Celebs With Bieber Fever!

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Usher

The "OMG" singer took a young Bieber under his wing early on. "I would love to be able  to be a part of shaping what he is to become," Usher told Us in December 2010.

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Taylor Swift

How does Swift feel about The Biebs? "I adore him," she raved to Allure in November 2010. "He's sweet and awesome -- I'll join his fan club."

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Diddy

The rapper promised to give the "U Smile" singer his $200,000 Lamborghini Gallardo Spyder when he turned 16 -- and he made good on his promise! "When you're 18, you get the house," Diddy joked.

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Kim Kardashian

After Bieber joked that the E! reality star was his "girlfriend" on Twitter, his fans bombarded Kardashian with "death threats" in May 2010. Unfazed, the two later posed in a Graduate-style photo shoot for Elle.

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Drake

The teen singer refers to the Degrassi alum (and fellow Toronto native) as his "big bro, Drizzy Drake." The rapper even added a verse to a remix of Bieber's hit song, "Baby," in 2010.

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Barbara Walters

The journalist named Bieber one of her 10 Most Fascinating People of 2010. "If the very thought of our next guest makes your heart pound faster, if the sound of his voice makes you cry uncontrollably... you've got Bieber fever," Walters said during the special.

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Selena Gomez

Though they haven't confirmed their relationship, multiple sources tell Us the two are in fact an item. "I love [Justin]. He's one of my best friends," Gomez told Us in December 2010. "I would do anything for that kid."

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Jaden Smith

The two first bonded while touring together in 2010. The best buds will perform their duet, "Never Say Never," at the Grammy Awards.

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Russell Brand and Katy Perry

"We want our own Justin Bieber," the Get Him to the Greek actor joked in June 2010. "We can't have the actual one because he's busy with his work."

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Chelsea Handler

"Justin acted like we were in a committed relationship and then was prancing around with Kim Kardashian on the beach like they're a couple," the Chelsea Lately host joked in September 2010. "Obviously the guy is not genuine and he's using the flirting card with anybody he meets."

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Sean Kingston

After meeting in 2009, the two collaborated on a song together. "I never knew his music, but his personality was just so big," Kingston tells Us. "We just kicked off right there and then."