5 Starlets with Bieber Fever

Justin Bieber's "My World 2.0" hit the top of the Billboard chart recently and it seems like everyone's obsessed with the "Baby" singer. In fact, Justin's fanbase has now expanded beyond screaming teenage fans to include other celebrities. Here are five starlets affected by Bieber fever:

1. Victoria Justice

She recently joked, "Oh, man! Bieber fever, man, call the doctor. I got it bad!"

2. Katy Perry

The recently engaged singer posted a photo of her kissing Justin with a message reading "Told you I would tap that. Yummy!"

3. Selena Gomez

The Disney star has said that she feels like a big sister to Justin, and when asked if she's also afflicted by the Bieber fever, she responded enthusiastically: "Of course! I do, absolutely, yes!"

4. Lily Allen

Lily tweeted: "I have to say I'm LOVING Justin Biebers Baby today. Printing up lyrics and planning on dancing round my office singing it all afternoon."

5. Allison Iraheta

Allison, a former "American Idol" contestant, owns up to it readily: "I have Bieber fever! Who doesn't?"