As Justin Bieber's My World 2.0 tops the Billboard albums chart, it's starting to feel like the whole world has a case of Bieber fever. And in addition to the legions of screaming teen girls who love the 16-year-old, young celebrities appear to be succumbing to Bieber's charms too.

"The Last Airbender" star Nicola Peltz gushed to MTV News about the pop star at the Kids' Choice Awards, where Bieber performed over the weekend. "I'm feeling the fever!" she said. Former "American Idol" contestant Allison Iraheta is also feeling hot for the teen star these days. "I have Bieber fever!" she shared. "Who doesn't?"

Selena Gomez, who once told us she feels like a "big sister" to Bieber, added that her loyalty runs very deep. But does she have the fever? "Of course! I do, absolutely, yes!"

Nickelodeon star Victoria Justice, whose new show "Victorious" premiered after the KCAs, added her name to the infected list. "Oh, man! Bieber fever, man, call the doctor. I got it bad!" she quipped.

Meanwhile, actress Jasmine Villegas, Bieber's love interest in the "Baby" music video, seemed to have a much milder case. "Of course, he's, like, a really cool friend of mine," she said. "But he's definitely super talented."

There have been some reported cases among male Bieber fans too. Boys Like Girls lead singer Martin Johnson said, "I think he's the man." And Bieber's "Eenie Meenie" collaborator, Sean Kingston, is happy that so many people have the fever these days. "That's my little bro," he said. "I'm gonna support him and be excited for him."

Bieber said he appreciates all the support his fans and other celebrities have shown him since being catapulted to superstar status. "It feels great," he said at the KCAs. "I'm just happy to be here, happy to have so many supportive fans."

Do you have Bieber fever? Tell us your symptoms in the comments!