Taylor Laytner+ Selena Gomez=???

Taylor Lautner and Selena Gomez claim they're just friends, but onlookers in Vancouver, British Columbia -- where he's filming New Moon and she's shooting Ramona and Beezus -- tell Life & Style the two are definitely a teen supercouple! On May 4, the duo dined at The Keg restaurant. "Taylor walked Selena back to her hotel afterward," says a witness. "When she didn't think anyone was around, she wrapped her arms around his neck and gave him a big kiss!" When it was time to leave, adds the witness, Taylor snuck out the back door.Things heated up even more during Canada's Victoria Day weekend. Selena, 16, spent May 16 shopping with Taylor's younger sister, the witness says. The next day, Taylor, 17, swung by Selena's hotel and picked her up for a late lunch at the Japanese spot Ichiban-Ya. As they sat in the back dining on sushi and sipping iced tea, an onlooker heard Taylor tell Selena, "You smell good -- I always smell you. I smelled you on my pillow this morning." Selena responded with a giggle, and Taylor picked up the check. Still, the duo haven't had the easiest time letting their romance bloom -- Taylor's father has been keeping a protective eye on them, and Selena has a large bodyguard who's often around. But despite the obstacles, the two have become inseparable in recent weeks, even going go-karting and checking out the flick 17 Again at a local theater. How cute!