Is Kristen Stewart the reason for Robert Pattinson-FKA Twigs wedding delay?

There are a number of conflicting reports on the status of Robert Pattinson and FKA Twigs' romance, with some news outlets claiming the couple has threatened to call off their wedding unless certain conditions laid out by both are met.

Pattinson, for instance, wants his ex-girlfriend Kristen Stewart to be invited to the wedding, reported Celeb Dirty Laundry, adding that the "Twilight" star wants his fiancée to accept the fact that Stewart will always be a part of his life.

The gossip website noted this could further delay the wedding, as Twigs wouldn't be comfortable inviting Pattinson's ex to their special occasion.

Twigs, in the meantime, has reportedly given Pattinson an ultimatum, saying she would call off the wedding if he doesn't marry her before the end of this year.

"Twigs has told Rob they have to get married this year," a source told HollywoodLife.com. "She's fed up of waiting, and wants something small, quiet and private, so it doesn't need any elaborate plans.

"It may even be a registry wedding, in front of a handful of friends and family in the UK," the source said. "She's told him she would like to do something in the summer, but has warned him she doesn't want this dragging on."

According to reports, the green-eyed monster has caused a strain in Pattinson and Twigs' relationship, and the singer is said to have asked her boyfriend to cut off all ties with Stewart.
Pattinson and Stewart started dating in 2009, shortly after meeting on the sets of vampire drama "Twilight."

Their relationship became strained in 2012 after it was revealed she cheated on him with her "Snow White and the Huntsman" director Rupert Sanders. Although Stewart and Pattinson gave their relationship another shot, they parted ways for good in 2013.