Twilight stars and real-life couple Kristen Stewart and Robert Pattinson have called it quits after over three years of dating.

According to People magazine, Kristen had planned a big party for Robert's 27th birthday last week, but he wanted nothing to do with it.

Neither of the stars' reps have commented on the story, and a source tells People that it wouldn't be surprising if they ended up back together once again.

Last summer Stewart was photographed making out with Snow White and the Huntsman director Rupert Sanders, which led the couple to split. They reconciled two months later after a public apology and admission of an "indescretion" from Stewart.

The alleged affair led to the breakdown of Sanders's marriage to model Liberty Ross

Stewart and Pattinson's relationship seemed fine over the last month, as the couple were spotted holding hands at this year's Coachella Festival in April and were spotted together again at the Met Gala earlier this month.