The 33-year-old has been planning her wedding day since Johnson popped the question back in November 2010, and she wants lots of people present at the lavish ceremony to witness them exchanging vows, reports femalefirst.co.uk
"I've been very picky on how I want everything to look and feel," she said. "Eric's family alone is almost 90 people, so it'll definitely be a big event," she added.
Simpson, who has daughter Maxwell, 2, and 10-month-old son Ace with her fiance, has remained tight-lipped about the wedding venue, but it appears her big day is soon approaching.
"We are very close to sending out our invites," she said. Simpson was previously married to Nick Lachey from 2002 until they divorced in 2006.