WATCH: Robert Pattinson Bites Babies?! Kristen Stewart Shocked by "Weird" Story

K-Stew says R-Pattz is "really weird" for pretending to bite a Twilight fan's baby while on the set of the first movie

Twilight stars Robert Pattinson and Kristen Stewart have gotten very close in the past three years, but there are still some things he's kept from her: like the time he bit a baby! In an interview at Comic-Con, Pattinson recalls a hilariously inappropriate photo-op that he did at a fan's request. And Stewart's horrified reaction is priceless. Watch below!

In the interview, Pattinson -- who plays chivalrous vampire Edward Cullen -- describes being taken by surprise on the set of the first Twilight film in 2008, when a fan handed her 3-month-old baby over to a mystified Rob. Pattinson, at first, thought she wanted him to autograph her baby. But in fact, her request was even weirder.

"I didn't really understand the reality of the situation at this point, that anybody would actually see this picture," Rob admits. "So there's a picture somewhere on the Internet of me biting this baby."

"You bit the baby?" exclaims Kristen. "That's so weird."

After trying to sheepishly justify his action ("I didn't actually touch it!"), Pattinson cracks a joke to further provoke Stewart. "It's kind of a funny picture. The baby is so young, its entire head fits in my mouth," Pattinson deadpans, getting a laugh from his costar/girlfriend.

Now that filming has wrapped on Breaking Dawn (which will be released as two films), Pattinson and Stewart are embarking upon their post-Twilight film careers. Stewart will star in a film adaptation of Jack Kerouac's novel On the Road, and will play a sword-fighting Snow White in Snow White and the Huntsman. (Pictures from Snow White were released at Comic-Con, showing an armor-clad Stewart -- not your average fairy-tale heroine!) As for Pattinson, he'll be appearing next in the period piece Bel Ami, as an amoral cad who climbs the social ladder by seducing powerful men's wives. And he's sporting that weird half-shaved hairdo for the recently wrapped David Cronenberg thriller Cosmopolis, just in case he needs to do some re-shoots.

Although it's exciting to see Robsten move on to new roles, it's bittersweet to see them alongside new leading men (like On the Road's Garrett Hedlund) and ladies (like Bel Ami's Christina Ricci and Uma Thurman). Even a 90-second video clip shows what amazing chemistry Stewart and Pattinson have together -- and we hope it continues in real life, long after their vampire days are over.

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