Robert Pattinson and FKA Twigs can't decide on wedding plans.

The 'Twilight' star and 'Pendulum' hitmaker have reportedly pushed back their wedding because Twigs can't decided whether she wants a ''low-key' event or an ''elaborate affair'', according to a source.

A source said: ''She talks about it keeping as real and low-key and then wants an elaborate glamorous Baroque affair. She was even talking at one stage about having a masked ball.''

The couple - who got engaged after a six-month romance - originally wanted to have a small pub wedding, but those plans have been thrown out the window and it's said to be much ''bigger'' now, which means it will more than likely be pushed back to later in the year.

The source told PEOPLE magazine: ''It will now be bigger but how big, nobody's quite sure at this moment in time,'' the source reveals. ''There's no fixed [wedding] date but will probably be late in the year.''

Meanwhile, the 29-year-old heartthrob said he would like to have children and asked how they would cope with being in the spotlight he said his child will be ''totally cool and confident''.

He previously said: ''I don't think so. I'm sure I'll have a child that's totally cool and confident. He or she will probably look at me every day and think to themselves: 'Why is this guy such a weird, crotchety man?'''