Kristen Stewart 'Cheating' on Robert Pattinson with Patrick Schwarzenegger: 'Twilight' Starlet 'Flirts' with Model at Taylor Lautner's Birthday Bash

Oh, here we go again with the ridiculous Kristen Stewart and Robert Pattinson drama! Despite the fact that inside sources repeatedly insist that the "Twilight" sweethearts are doing just fine, bogus "cheating" scandals manage to pop up all over popular gossip sites. The latest shady rumor? K-Stew is cheating on her "Cosmopolis" beau with gorgeous model and aspiring actor, Patrick Schwarzenegger! Apparently, the 22-year-old starlet was flirting and "hanging all over" the 19-year-old heartthrob at co-star Taylor Lautner's 21st birthday party back in February. The chemistry was so hot, fellow party-goers were surprised that they didn't sneak off and grab a room together. Will Pattinson please return from Australia soon so these ridiculous rumors finally come to an end! If that's even really possible...

As Gossip Cop reports, a recent issue of Star magazine claims that Stewart has taken “taking full advantage of her new-found freedom” while R-Patz is off filming "The Rover" in Australia. She's been flirting it up with other guys nonstop - right in front of the pair's mutual friends!

The seedy tabloid reveals: “When [Stewart] was at pal Taylor Lautner’s birthday part in L.A. on Feb. 9, Rob seemed to be the furthest thing from Kristen’s mind — she was seen hitting on 19-year-old Patrick Schwarzenegger.”

(FYI - Lautner turned 21 on Feb. 11. Yay!)

Yeah.. this same gossip rag also claims that K-Stew's distanced herself from the public because she misses Pattinson so much. She sits around waiting for his calls, and is completely devastated that he so blatantly ignores her. Pretty conflicting reports...

Anyway, an alleged insider insists, “She was creeping on Patrick big time. People were saying they should get a room because the energy between them was so hot.”

And apparently Stewart's charm ultimately won over Schwarzenegger's young heart - the duo has supposedly “been on a few low-key dates since their flirtatious run-in.”

Okay, enough.

Star magazine is known to sensationalize and exaggerate relationship drama between the "Twilight" couple. Yes, K-Stew's been spending more time out with friends now that R-Patz is thousands of miles away... is that such a bad thing? It doesn't mean that she's cheating on him! In fact, a pal close to the pair claims that they can't wait to finally reunite soon... Stewart is currently "counting down the minutes."

Gossip Cop got in touch with a source close to the situation who insists that such cheating rumors are completely untrue. Again, Star magazine seems to be a little off on its reputability...