LOS ANGELES -- These days, the eyes of Hollywood are upon the "New Moon" stars as they move out of their comfort zones and select non-"Saga" film projects. And few are more intriguing than Taylor Lautner's upcoming movie "Valentine's Day," which has the young heartthrob appearing opposite rumored girlfriend Taylor Swift in a subplot that revolves around them mostly, well, swapping spit.

"They just had to make out," grinned one of their co-stars, Emma Roberts, as she recently remembered a day watching the two young superstars filming the movie. "That's all I saw."

Hoping to be next year's "He's Just Not That Into You," the star-studded romantic flick features everyone from Anne Hathaway to Ashton Kutcher, Jennifer Garner to Jamie Foxx, Topher Grace to Julia Roberts to "The Hangover" star Bradley Cooper -- heck, it even has both Jessicas, Biel and Alba. But while the February 12 film's recently released trailer displays all those actors -- and even gives a line to Hector Elizondo -- there's no mention of anyone named Taylor.

"I'm a big 'Twilight' fan; I read all the books in a matter of two weeks ... Bella and Jacob are my faves," insisted "Hotel for Dogs" star Roberts, who attended the "New Moon" premiere. "I am Team Jacob, solidly."

So, when the 18-year-old actress had the chance to film "Valentine's Day," she made sure she was on set when Lautner filmed his scenes, even though she wasn't needed. "We didn't have scenes together, but I met him on set," she recalled. "He's a really good guy.

"He has scenes with Taylor Swift," she said of Lautner's subplot, which fueled huge tabloid interest earlier this year alongside [article id="1617348"]rumors that Taylor/Taylor[/article] were more than just an on-camera item.

"When you say it like that, come on!" Roberts laughed, insisting that there was more to their story line than simply making out. "Yeah, it was fun. They were both really cool. I hung out with them a little bit.

"Everyone in the world is in it," she said of the movie. "Jennifer Garner, Jessica Alba, Jessica Biel ... it involves all these mini-relationships."

Check out everything we've got on "Valentine's Day."

For young Hollywood news, fashion and "Twilight" updates around the clock, visit HollywoodCrush.MTV.com.