Kristen Stewart vs. Dakota Fanning Beef? 'BFF' Supports Robert Pattinson's New Girlfriend FKA Twigs, Disses 'Twilight' Ex?

Kristen Stewart and "The Runaways" co-starlet Dakota Fanning have remained close friends for years. So why is the 20-year-old blonde beauty spending so much time with K-Stew's ex-beau, Robert Pattinson?

Despite his on-and-off again relationship with the "Twilight" muse, 28-year-old Pattinson has officially moved-on with aspiring English songstress, FKA Twigs. The two appear extremely happy together, and R-Patz is a loyal supporter of Twigs' blossoming music career.

Apparently, 24-year-old Stewart isn't jealous of her ex's new romance. But is it tough seeing one of her very close gal pals party with the two?

According to the infamous gossip webloid HollywoodLife.com, Fanning recently attended Twigs' sold-out concert in NYC earlier this month (November 8). Of course, Pattinson was in attendance too (along with a group of other friends). But not Stewart, obviously.

Acoustic British rocker Bobby Long was also spotted among the crowd - everyone was laughing, drinking, and having a good ol' time together. HollywoodLife eyewitnesses insist Pattinson "couldn't keep his eyes off of Twigs" the entire performance. When the show ended, the crew (including Fanning) all left to party together.

Later on that evening, R-Patz was caught with his new sweetheart at a nightclub alongside fellow songstress Rihanna.

Anyway, rumors suggest that if Fanning is "siding" with Pattinson, it's a major "diss" towards Stewart. Or perhaps is she "spying" for the "Camp X-Ray" beauty?

Sounds pretty ridiculous, either way. All fabricated drama. Another "legit" source for GossipCop confirms, "There's no truth to any story suggesting otherwise. Period."

Fanning and K-Stew just hung-out last week - see the photos here.

Robsten's over - that's that!