The "Twilight" co-stars broke up in May after dating for about three years.
The two hit a rocky patch in July 2012 when Stewart was caught up in a cheating scandal with "Snow White and the Huntsman" director Rupert Sanders. They separated for two months, during which Stewart penned an open-letter apology to Pattinson and professed her love for the actor publicly for the first time. They then reconciled until splitting again this past spring. However, they are occasionally seen together on what appear to be dates.
"Kristen has decided that she won't spend Christmas with Rob in London because she knows he will be with his family and she doesn't feel welcome by them, even though Rob invited her," a friend of Stewart's told HollywoodLife.com.
"If she goes to visit Rob in England, it will be after Christmas," the unnamed source said. "She really wants to go to the Isle of Wight with Rob, and it's a possibility they may celebrate the new year there, like they have in the past. This is how she wants to bring in the new year -- in a pub, drinking beers, laughing, listening to music with Rob."