Katy Perry has been spending time lately with Robert Pattinson, which sounds like a bad "dream" for Kristen Stewart.

Kristen is apparently quite upset that Rob has been hanging out with the "Teenage Dream" singer, especially since she thought she and Katy were pals, according to In Touch.

Kristen is reportedly now realizing that Katy was "only friends with Kristen for Rob." Yikes.

“[Kristen] feels hurt,” the insider says. “She feels betrayed.”

Meanwhile, Hollywood Life is reporting that Kristen wants Katy "to back off."

However, a source suggests that Katy  who was spoted with Rob at a wedding last month  might not be willing to do so.

"The timing was never right [for Rob and Katy]," says an insider. "Katy’s the kind of girl who goes after what she wants until she gets it."

So does this mean Katy and Rob might start dating soon?

But wait - we haven't even come up with a mash-up name for them yet! Robty? Perryson? Ack! We need more time, people!

Source: In Touch via Hollywood Life