Kristen Stewart On Robert Pattinson's New Girlfriend FKA Twigs, 'Happy & Bittersweet' - Nicholas Hoult & 'Equals' Beauty Now Dating, 'Inseparable'

Apparently, Robert Pattinson is currently dating an aspiring English songstress named Tahliah Debrett Barnett (better known as FKA Twigs). This is the 28-year-old British heartthrob's first "serious" relationship since breaking things off with "Twilight" sweetheart, Kristen Stewart. So, how does 24-year-old K-Stew feel about that?

She's since moved-on, so she's happy to see R-Patz do the same. But still, the reality of the situation is rather "bittersweet."

An alleged HollywoodLife.com insider reveals that the "SWATH" beauty "definitely" saw the photos of Pattinson cuddling-up and holding hands with Twigs. Just over the weekend, the new Hollywood couple took a nice stroll down Venice Beach boardwalk with friends, and they looked so exited being together. Since their first moments of "PDA,"Pattinson and the LP1 singer have been spotted out-and-about in LA together on several different occasions.

Thankfully, K-Stew isn't exactly jealous, but there's still some emotion involved:

"Kristen knows about Rob and Tahliah. It's bittersweet," the supposed snitch reveals. "I mean, she's happy that he's happy, but it stings. She knows it must be serious if he's being affectionate with her in public. She knows he's ultra picky and wouldn't hold hands with someone for the world to see unless he was really into her."

But that doesn't mean she's ready to double-date anytime soon:

"Let's just put it this way, Kristen is just glad she's not in LA," the source explains. "The last thing she would want is to run into them. It's just weird still. Still a sensitive issue."

But fans of the "Camp X-Ray" starlet shouldn't worry - she seems to be getting VERY close to "Equals" co-star, Nicholas Hoult!

Another HollywoodLife insider claims that the pair spends lots of time together - both on and off-set.

"Kristen and Nick are inseparable. They are constantly hanging out together when they aren't on set. They've really bonded with each other and are like best friends now. It wouldn't surprise any if us if it turns into something more serious, something romantic." 

Do Mstars readers think they make a cute couple? Apparently, K-Stew's pretty interested in Jennifer Lawrence's ex-boyfriend:

"When Kristen is on location for long periods of time, she usually has a good friend come stay with her but not this time cause she has Nick," the source said. "They love playing practical jokes on the cast and crew, playing pool, just exploring and hanging out." 

So - is Robsten done for good this time?

The drama/sci-fi flick "Equals" is set to hit theaters sometime in 2015.