Kristen Stewart vs. Katy Perry Beef, Robert Pattinson Shades Ex-Girlfriend Amid FKA Twigs Engagement? Flirty Fling 'Wedding Role' Ignites Heartbreak

Following Robert Pattinson's rather messy break-up with Kristen Stewart, rumors suggest that the "Twilight" heartthrob briefly hooked-up with "Dark Horse" beauty, Katy Perry. The two remain very close friends, and now R-Patz apparently wants the 30-year-old pop darling to take part in his upcoming wedding to fellow songstress, FKA Twigs!

Another dagger slammed right into K-Stew's already suffering heart?

An alleged "insider" tells the popular gossip webloid HollywoodLife.com that the 28-year-old British actor wants to tie the knot very soon - although the couple only started dating less than a year ago! But he's already making plans for the ceremony (supposedly involving the "I Kissed A Girl" sweetheart):

"Yes, for sure she's been invited to the wedding, she will actually play a significant role at their ceremony... Katy absolutely adores Tahliah and is so happy for Rob. She's never seen him happier."

How cute! But despite displaying a rather tough exterior, apparently Pattinson's longtime ex is completely heartbroken. The "Cosmopolis" hottie never even told 25-year-old Stewart that he planned on proposing!

"When Kristen first heard that Rob and FKA Twigs are engaged, she felt devastated. She doesn't want to believe it's true and was seriously hoping that this was just some sort of April Fool's joke... After only five months of dating, she can't believe Rob would propose to FKA. She and Rob dated for years! Hearing this has really taken a blow to Kristen's confidence. She was holding out major hope that there wasn't any truth to their engagement... Kristen is especially hurt to hear that Rob is engaged to FKA because marriage is something she obviously spoke about with Rob when they were dating. Of course they did, they were together for so long!" (HollywoodLife.com)

Perry and Stewart were once pals, too - but apparently the "Roar" superstar ultimately chose a side. She was recently spotted rocking-out to Twigs' performance at Coachella earlier this month. Of course, Pattinson was in attendance, too.