Brad Pitt has turned into a groomzilla.

The couple are set to tie the knot on their sprawling estate Chateau Miraval in France in front of just 20 guests including their six children Maddox, 10, Pax, nine, Zahara, seven, Shiloh, six and four-year-old twins Knox and Vivienne.

A source told The Sun newspaper: "Angelina isn't so bothered about when they tie the knot - it's Brad who is piling on the pressure.

"He wants the main house to be finished when the event takes place, even though the close friends and relatives who are invited aren't the types to care.

"He wants everything to be absolutely perfect."

Meanwhile it has been claimed the couple - who met on the 2004 set of 'Mr. & Mrs. Smith' - had plans to get married from the start of their relationship, according to the man who designed their engagement ring.

Robert Procop said: "Brad and Angelina are a very romantic couple. They always knew they'd be together forever and get married one day, right from the start."

Robert also believes their relationship has matured with time.

He explained: "The relationship may have been all flying planes and riding motorcycles at the start, but any new relationship is exciting that way.

"Now though, they've settled into this wonderfully strong family unit and it's beautiful how in love they are."

The designer added: "They're both lovely, very talented people that complement each other . . . when you're with them, you can see how strongly in love they are."