Holly MONTAG puts a SHIV in Lauren CONRAD's back! Stacie and Frankie DATING!

Lauren Conrad may not realize it, but there's a knife in her back.

L.C.'s supposed pal Holly Montag has already jumped ship to Team Kristin. "I think Kristin's openness is going to be far more entertaining than anything Lauren had to offer," Holly told us after enjoying some afternoon cocktails at yesterday's Oakley Intro to Summer event at Skybar in West Hollywood.

What else did Montag have to say? Read on to find out…

"Lauren's always been very conservative, which is good for her values, but Kristin just wants to put everything on the line because she thinks reality is real," Holly said. "Kristin doesn't hide anything. She's seriously the most real girl you'll meet in reality television."

But Holly doesn't doubt L.C. will have success outside of reality. "I'm happy she's done with this," she said. "Now, that she's out if it, I have no doubt she'll be a successful designer. She's so talented and driven."

Meanwhile, Stacie "The Bartender" Hall, who is dating fellow Hillster Frankie Delgado has already partied with Kristin on Frankie's birthday. "Kristin's a really fun, outgoing person, and I think we're going to have a great time continuing to film," Stacie said. "Lauren is a good, good girl, but Kristin is more outgoing and crazy."

Things aren't, however, going as smoothly for Kristin and Audrina Patridge. Audrina recently revealed she's no fan of L.C.'s replacement. "There have already been a few fights between them," Stacie said. "There's a lot of competition there."
—Reporting by Dahvi Shira