Kristen Stewart might be secretly hooking up with Jennifer Aniston’s fiancé Justin Theroux after she was spotted getting cozy with the actor, celebrity blogger Perez Hilton reported Wednesday.

It was just recently rumored that Stewart had finally won back the affection of her former beau, Robert Pattinson, after their split caused by her fling with her “Snow White and the Huntsman” director Rupert Sanders.

But all the good faith that Pattinson, 26, has decided to put in the 22-year-old Stewart might have been moot considering the coquette actress was spotted having a “very flirtatious chat” with the “Wanderlust” star Theroux at the Chateau Marmont, according to sources who saw Jennifer Aniston's fiance and the “Twilight” starlet.

The insiders explained to Perez Hilton that it was Stewart who approached 40-year-old Theroux while he was enjoying a drink with one of his pals:

"Within the first few minutes, Kristen had already begun flirting it up with Justin. The conversation must have given Justin’s friend the hint to leave them alone to chat because that is exactly what he did! During their hour-long hangout sesh, the flirtatious Kristen did not seem coy about making her intentions known to Justin."

The witness was reportedly shocked by the sultry exchange between both of the actors.

It wouldn’t be a surprise if Stewart were actually hitting on Theroux; she would just be building on her reputation for being attracted to older men considering her scandal with the 41-year-old film director.

According to Perez Hilton’s spy, the conversation between the two celebrities consisted of lots of giggles and even touching hands.

The source continued:

“It was kind of surprising to see, but she seemed completely relaxed.”

Pattinson and Aniston better keep their eyes open because it wouldn’t be the first time either of them have been cheated on by their significant others.

Do you think Stewart and Theroux are having a fling?