Because they're not dating and she's moved on, obvs.
Robert Pattinson hit the Coachella Music Festival this weekend with Katy Perry sparking speculation the good friends could be dating. While these rumours flare up whenever the famous friends hangout, it can't be nice for Rob's famous ex Kristen Stewart who Katy had to reassure the last time romance claims were rife, that the couple are just friends.
Rob and Katy were pictured at the festival in Palms Springs on Sunday, with insiders telling The Sun the pair have such "sizzling chemistry," that they're bound to get together.
Kristen it seems didn't go along to the festival as she was in New Orleans for new movie American Ultra but sources close to the actress have insisted she wasn't fazed when she heard the couple were hanging out.
Kristen on the set of her new movie American Ultra (SplashNews)
"Kristen doesn't care if Rob and Katy spend time together," a source told HollywoodLife, "She knows they are just friends. She just wishes she could have been there, but her works comes first."
So what about Katy and Rob getting together? Could it happen. Last year the Roar star explained why she'd never go there with the Twilight hunk.
"Okay, so here's the proof there was never anything going on with me and Robert Pattinson," Perry told Elle UK. "I fart in front of him. Properly fart. And I never, ever fart in front of a man I am dating. That's a rule."
Katy Perry said she farts infront of Rob so can't date him (WENN)
"He's my bud, I'm like his big sister," she explained. "We just hang out. The other day, I said, 'One of the things I'm most proud of is not sleeping with you, Robert.' And that's true."
Revealing she had to explain to Kristen nothing was going on when she was linked to the actor following the couple's split, Perry went on: "I sent her a text message saying, 'I know you've seen all this stuff, but you know I would never disrespect you. I'm not that person. I'm just trying to be a friend to him but it is unfortunate that I do have a set of tits."'
