Justin Bieber - Justin Bieber Starts Birthday With Radio Chats

The pop superstar introduced the Canadian newcomer to North American audiences and chatted about his birthday plans.

In an interview with Los Angeles DJ Ryan Seacrest, Bieber revealed he planned to celebrate his big day by adding to his property portfolio, explaining, "I think I'm gonna get another place in L.A."

Tmz.com reports the birthday boy has his eye on two "ultra-expensive mega-mansions" in Hollywood and Calabasas, where reality TV family the Kardashians and Britney Spears live.

The website reports the pad he likes in Hollywood is currently being rented by Ashton Kutcher.

He also used the birthday radio chat to clear up rumours suggesting he has proposed to girlfriend Selena Gomez.

Bieber insisted fans and bloggers are reading too much into the jewellery gift he recently bought for the singer/actress and the new 'J' tattoo she has had inked on her finger.

He told Seacrest, "I'm not engaged... We're still young."

Meanwhile, Gomez has sent her best wishes to her beau via Twitter.com.

She writes, "Happy birthday to my best friend in the world world!!! Have a great birthday baby!"