As filming for Twilight sequel New Moon gets under way there's only one question on everyone's lips - will Robert Pattinson and Kristen Stewart hook up?

According to cast mates and close pals their close chemistry is only reserved for on-set action between their characters, star crossed lovers Edward Cullen and Bella Swan.

Edi Gathegi, who plays Laurent, tells eonline.com, "I can't even think of those two together at all.

"Kristen has a boyfriend! It's on-screen and that's it."

And on-screen sister Ashley Greene, who plays Alice Cullen, insists that any magic is simply as a result of good acting: "Their chemistry is fantastic, but no, they are not in a romantic relationship.

"They are good actors [is] basically what it comes down to."

While Kristen passes up the opportunity to date one of Hollywood's hottest young stars, Rob's romantic side is on full alert as he searches for his soul mate.

See Rob and Kristen sizzle on-screen in Twilight below