Following her split from Robert Pattinson, Kristen Stewart is reportedly in a serious relationship once again – with former assistant Alicia Cargile.

"They are getting very serious," a close friend told RadarOnline.com. "Kristen and Alicia are not only living together, but they act like an old married couple."

The insider also claimed that the "Still Alice" actress, who is known for keeping to herself, has supposedly been able to be herself and open up to her girl pal. 

"Kristen displays her bada** façade at all times as a way of protection. She does not allow anyone too close, except for Alicia that is. With Alicia, Kristen does not have a façade."

"Very few people can actually get to know the real Kristen and that is how she likes it," the insider continued. "But when Kristen is with Alicia, there are no walls around her. She not only acts like herself, but she is also incredibly genuine because Alicia brings out the best in her."

Moreover, it is Cargile who makes Stewart so happy, as the insider said that the "Twilight" star is "finally in a relationship where she is just loved unconditionally, but not because she is a movie star."

With that being said, Stewart has reportedly moved on from her ex-boyfriend for good.

"As far as Robert Pattinson goes, that is just a joke. Kristen could care less what he does, who he is with, or where he lives. Kristen will never stop being who she is for her ex. That is done. Done," the insider added. "Alicia and Kristen love each other very much, and it shows by their constant affection towards one another."

Meanwhile, Kristen Stewart previously revealed what she looks for in a relationship and what kind of person she is usually attracted to.

"For me, the most attractive thing in a person is drive -- genuine, impulse expressed for the sake of it, not for perception. I think that's hot," she said in an interview with CR Fashion Book. "It's not hard for me to figure out who I like or who my friends are. I trust my energy meter, but I'm also not afraid to let people in who might hurt me."