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Rob Pattinson is proudly showing off his new wacky 'do while posing alongside Twilight co-stars Kristen Stewart and Taylor Lautner.

The sexy 25-year-old actor debuted the look at Comic-Con in San Diego while promoting Breaking Dawn - Part 1 ... hitting theaters on November 18.

So why the new haircut? Mr. Pattinson is filming the upcoming thriller Cosmopolis, and during one scene, he runs out of the barber shop halfway through his haircut. Um, ok.

As for the "hardcore" birth scenes in the upcoming Twilight flick, Rob tells the Comic-Con crowd:

    "For a fantasy series that's aimed at a young audience, it goes quite far. It's quite graphic. There's no way to do it in any kind of tame way."


Find out what Kristen Stewart said about the birthing scene ... after the jump.