Justin Bieber is said to be so desperate to have Selena Gomez back that he'll even serenade her in front of millions of viewers. The Canadian tween heartthrob will reportedly sing "Take You" at the Billboard Awards for the former Disney star, who will also be in the show on Sunday.

According to the Hollywood Life, the 19-year-old singer will be performing his song "Take You!" for his on-off girlfriend, while Selena will sing her sexy track "Come & Get It."

"Justin loves Selena's music. He is working hard to be a gentleman and he knows her music is important to her, so he's really being nice to her about that," a source told the gossip site.

"Justin can't wait to see her again and is always talking to her about things he wants to do when he's back in the U.S., and she's hoping he can keep his promises."

Selena recently said in an interview that she was "available," which surprised fans as had gone to Norway last month to be with Justin. Her now ex-boyfriend even posted a photo of them on his Instagram account.

But if they got back in Norway and broke up again last week, then they must be together again this week as they were spotted partying at a Los Angeles hot spot on Tuesday night.

A source told E! News that they came in with their security around 11:30 pm through the private back entrance of Supperclub. Jelena - the portmanteau of their names - were apparently holding hands in the club. They left just after 45 minutes.

Also late Tuesday morning, Selena was seen leaving Justin's home.