Robert Pattinson Disses Kristen Stewart, FKA Twigs Engagement Shocker Sparks T-Pain Beef? 'Twilight' Heartbreak 'Hurts' Ex-Boyfriend

Robert Pattinson fell extremely hard (and fast) for English songstress, FKA Twigs. After just six short months of dating, rumors suggest that the "Cosmopolis" heartthrob recently proposed marriage to the "Two Weeks" beauty.

And longtime (ex) girlfriend Kristen Stewart never saw it coming!

Apparently, rapper T-Pain broke the engagement news before R-Patz could personally talk to K-Stew. The 28-year-old British actor didn't mean for her to find out that way, and now he feels horrible about it. An alleged insider tells the popular gossip webloid HollywoodLife.com:

"Rob had planned to tell Kristen when he got back to the states, where he is now... He wanted to meet up with her in LA and tell her the news about his engagement firsthand, but as we all know that never happened because Faheem (T-Pain) blabbed. He wasn't happy that Kristen had to find out in such an impersonal way."

Does the "Bartender" emcee owe the former "Twilight" lovers a huge apology? Good luck getting a collaboration with Twigs, now!

The "Still Alice" starlet has yet to move-on romantically, but she's so busy with her career that Robsten isn't even an issue anymore. Still, the current situation bothers her:

"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," another supposed snitch reveals. "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!"

Curious to see which Hollywood hottie Stewart is now leaning on for support? Click here!

Pattinson and Twigs have yet to make an official engagement announcement. But "The Rover" star is a very private guy - will the couple ultimately wed without anyone evening knowing?