Twilight heartthrob Robert Pattinson has lots of adoring fans, but finding that one real-life leading lady is proving to be more elusive for him. "No one seems to get into a relationship with me," admits Robert, whose character, vampire Edward Cullen, is often described as the ideal man. "I'm a loner."

Indeed, "he's really quiet," Rob's Twilight castmate Sarah Clarke, who plays Renee Dwyer, confirmed to Life & Style at the Diamond Information Center and InStyle's pre-Golden Globes luncheon in LA on Jan. 8.

But another co-star, Ashley Greene (who plays Edward's sister, Alice), claims it just takes a while for Rob to warm up to others. "Once you get to know him, he's really outgoing and fun," Ashley tells Life & Style. "He's a sweet guy, but he's different."

For the inside story on Robert's rocky love life, pick up the latest issue of Life & Style, on newsstands now!

Photo Credit: BEImages