yes, they are dating. Kristen said in a Glamour interview that "My boyfriend is English". Robert Pattinson Is an English. Also, you can see that Kristen often wears a golden ring, if you look it detail, you will find out that it actually has "Rob" printed on it. Thay knew each other in 2008 for filming twilight, they soon had the relationship same as Edward and Bella in twilight. You can see many common things between them such as they both brush their hands into their hair a lot. And also because of this, their fans (twihards) call them Robsten as the combination for Robert and Kristen.