Robert Pattinson, Girlfriend FKA Twigs Rumors: Diet To Improve Sex Life? Kristen Stewart's Ex Now Obsessed With Tahliah Barnett?

Robert Pattinson is reportedly obsessed with girlfriend Tahliah Barnett as the singer, who also goes by the name FKA Twigs, has allegedly put the actor on diet to improve their sex life.

According to Celebrity Dirty Laundry, during the short time that the couple has been together, Robert Pattinson "has basically put his career on hold to follow Tahliah on tour, convinced her to move in to his Hollywood home, and is even discussing marriage with her."

The whirlwind romance between Robert Pattinson and girlfriend FKA Twigs even had some fans "scratching their heads" and Kristen Stewart, his ex-girlfriend, is reportedly "worried" that a wedding could be in the horizon, the tabloid site added.

In a related report, OK! Magazine talked to some of Robert Pattinson's friends who reportedly expressed their concern regarding her influence over him.

The source said: "Rob's been going through a very strange phase, and while there's no doubt he's sweet on Tahliah, he's partying way too hard for his own good and acting like a total space cadet."

Even if fangirls swoon over Robert Pattinson's persona as a cool and reluctant Vampire in "Twilight," the British star actually grew up as a nerd.

"He's easily influenced and this is a classic case of Rob trying to impress the cool crowd of hipsters he's been hanging out with," the source added.

And this influence reportedly has expanded to the bedroom where Robert Pattinson's girlfriend FKA Twigs is reportedly "outperforming" him. To do something about it, she got him on a diet and regular exercise so he could catch up.

"FKA's so fit it's not funny and she outperforms him in the bedroom all the time. He's very unfit, smokes and drinks way too much, but she's convinced him he'll be much happier if he's more healthy," the source told the magazine.