Selena Gomez & Nick Jonas' Cyber Love

Selena Gomez and Nick Jonas have taken their relationship to the next level -- online.

Gomez, 16, and Nick, 15, can't stop sending each other saucy e-mails and texts from their Blackberrys since hooking up earlier this summer.

And, while the e-mails aren't X-rated, they are teeming innuendo.

"I love your mouth and I love your smile. It totally melts me," Nick wrote to Selena, according to Star magazine.

They even send each other cute notes when they're in the same room together.

"They have inside jokes and write sexy little things -- he's totally in love," the source says. "They are addicted to e-mailing each other. That's what teenagers do!"

Both teens have repeatedly denied rumors they are a couple - but have hinted at their relationship in two separate magazine interviews - fueling reports they are dating.

Speaking of one romantic date to Twist magazine, Gomez recently revealed, "I had dinner on the beach with a crush and there were lights on the palm trees! Then, went walking on the beach, and after that we slow danced. Wait, it gets better. While we were slow dancing…my crush and I had our first kiss! And after it, I leaned back and I said, 'You cheated.' And he said, 'Why' and I said, 'I don't kiss on the first date.' Then he said, 'Well, I never really play by the rules.'"

And Jonas shared details of a similar romance in Girls' Life magazine, telling the publication, "On one date, the girl said to me, 'I don't kiss on the first date.' So I said, 'I don't follow the rules.'"

Gomez recently attempted to dispel rumors she was being romanced by Jonas, claiming she was "too busy" and too young to date.