The blonde beauty, who is engaged to One Direction hunk Zayn Malik, admits she initially wanted an intimate nuptials but she has decided to get Jesy Nelson, Leigh-Anne Pinnock, and Jade Thirlwall involved in the occasion because they are ''desperate'' to be part of her big day.
She said: ''It's going to be a massive circus.
''I actually wanted to have quite a small wedding, but then all the girls in my family are desperate to come and would like to be bridesmaids too.
''I realise my wedding is every journalist's dream. It's going to be like the movie '27 Dresses' where the bride has like a billion bridesmaids.''
Perrie has also asked Zayn's One Direction bandmates - Niall Horan, Harry Styles, Liam Payne and Louis Tomlinson - to be ushers at the couple's wedding, but admitted she doesn't know when the event will happen yet because the pair have been too busy to arrange anything.
She explained: ''Zayn and I have had no time to start properly planning. The engagement kind of just happened and then we've been away from home all year.
''But, put it this way: I don't want to be engaged for 50 years. We'll get there soon.''
While the 20-year-old star admits she hates flying, she was delighted when Zayn took four flights in five days over the summer just to see her for a few hours.
She added to The Sun newspaper: ''Bless him, he's noble. He travels all the time to see me'', she blushes.
''It's really good because I hate flying. But I'll do it when I have to.''
Perry appeared on James Corden's 'The Late Late Show' on Monday and addressed her long-standing rivalry with Swift.