Turns out Peter's wife Jennie Garth was misquoted as spilling the beans that Rob is dating a "Twilight costar"

On Thursday 13th August 2009, @peterfacinelli said:
Complete media fabrication. I read the transcript of what my wife actually said, which was, "My husband talks to me about Twilight stuff, but I promised him I wouldn't talk about it." Somehow that got turned into this.
Its unbelievable how the media can just write whatever they want to sell papers.
Perez, love ya, but check your sources before u blog buddy.
SOURCE- Peter's Twitter
This below from Access Hollywood on what was really said by Jennie Garth:
Despite a report in the New York Daily News’ Gatercrasher that claimed Jennie confirmed Pattison is dating one of his co-stars, the actress did not reveal anything about the identity of Pattinson’s lady love, Nicole Nasser, Jennie’s personal rep told Access.
Instead, Jennie, whose husband, Peter Facinelli, stars alongside Pattinson in the “Twilight” series, simply confirmed she knows who he is dating, Jennie’s rep said.
“I can’t say,” Jennie reportedly said. “That will be breaking my promise to my husband. But I do know.”
Dani's 2 cents...don't believe everything you read in the media, sad thing is they spin and misquote and out right lie sometimes about things. SHOCKER I KNOW! Keep your mind settled on the positive, Rob is a fox and you can oogle his goodies without drama here anyday.
I know that makes me feel better.