Jessica Simpson has banned guests from taking photographs at her wedding.

The 33-year-old beauty, who is reportedly set to marry her fiancé Eric Johnson at the San Ysidro Ranch in Montecito, California, at 4  p.m. Saturday, has warned her family and friends they won't be allowed to capture any special moments at their nuptials, as they have inked a lucrative magazine deal for the occasion.

A source told the MailOnline that the 'With You' hitmaker, who has two-year-old daughter Maxwell and 12-month-old son Ace with former NFL star Eric, sent a strict email out to her guests, instructing them not to bring any cell phones or cameras to the venue.

The lengthy invitation reads: "Please note that there will be no cell phones or cameras allowed at the wedding location. We kindly ask you to leave your cell phones and cameras in your hotel room or check them in upon arrival with our security team. Security will be checking all guests upon arrival."

The couple's wedding weekend will kick off Friday night with a bash for America's Independence Day, themed 'Let's Celebrate the Red, White and Blue,' ahead of their black-tie "rustic chic" nuptials tomorrow evening.

The invitation states: "On the 4th of July, guests will be allowed to have their phones and cameras. We look forward to sharing the photos and intimate moments from this day with our guests only. We kindly ask you to refrain from posting images or details on your social networking sites in order to respect and protect our privacy.

"We hope that this weekend leaves you with memories that will last a lifetime."

The former 'Fashion Star' judge, who announced she was engaged to Eric in November 2010, was previously married to Nick Lachey and has hired the same wedding planner, Mindy Weiss, for her second trip down the aisle.

The celebrity party planner said: "I'm really excited about it."

This will also be Eric's second marriage, as the 34-year-old Yale graduate was previously married to Keri D'Angelo for five years before their divorce was finalised in October 2010.