Cover Story: New Moon Secrets Revealed

After deeming the 20-minute Sage & the Dills concert at Vancouver hot spot Metropole too short for his taste, an enchanted Robert Pattinson invited the band and his fellow New Moon co-stars, including Kristen Stewart, back to his hotel for an impromptu jam session on April 18.

As Robert, who plays dreamy vampire Edward Cullen, strummed his guitar, on-screen sibling Jackson Rathbone (Jasper) played harmonica while their big-screen sister Nikki Reed (Rosalie) added lyrics she had practiced onstage earlier that evening while serenading cast mate Taylor Lautner.

“We just got really creative,” lead singer Sage tells OK! of the intimate hotel-room session, which sounded like a mix of old-school rock and country as well as Van Morrison, Robert’s favorite rocker. “Everything blended together really well.”

Whether they’re making music or shooting Twilight sequels, the tight-knit cast of the vampire series works — and plays — as a true team. “It is weird that the minute we all met, it felt like family,” Kellan Lutz, who stars as Edward’s bloodsucker brother Emmett, tells OK!. “The first day we got on set, a lot of us felt like we’d always been related.”

PHOTOS OF ROBERT & KRISTEN'S NIGHT OUT:

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But that hasn’t stopped Kellan, 24, from clobbering Robert when the cameras are rolling. While working on a scene in which their bodies collide, the actors learned that they have differing methods for stunt work — high school football star Kellan actually knocked the wind out of Robert.

MORE ROBERT PATTINSON:

“He didn’t think I’d actually nail him, but that’s what the script said I was supposed to do,” explains Kellan. “I didn’t go out of my way to hurt him, but there is Rob, trotting along, and bang!”

But on-set mishaps haven't changed anyone's feelings about the New Moon shoot, says Ashley Greene, who plays Alice Cullen.

“The first one, we all had no idea what we were getting ourselves into,” she tells OK!. “We all have our bearings now, and it is more fun and less stressful."

To find out the truth behind all those romance rumors and the latest info on the newest characters to join the Twilight gang, pick up the new issue of OK! — on sale everywhere Thursday!