We're engaged! Brad Pitt proposes to Angelina Jolie with a custom made ring

• A-list couple say their six children are 'very happy'
• Actress' father Jon Voight also thrilled about the news
• Couple's private jeweller Robert Procop reveals actor commissioned diamond design

After seven years and six children,Brad Pitt and Angelina Jolie are finally engaged. 

Robert Procop, a private jeweller for the couple, today revealed he designed an engagement ring for the actress under the actor's guidance. 

And Brad's spokeswoman Cynthia Pett-Dante later confirmed the news, saying: 'It is a promise for the future and their kids are very happy. There's no date set at this time.'

The 36-year-old actress was spotted wearing the ring on her wedding finger at the Chinese Art collection at the LA County Museum earlier this month, where she was pictured with Brad, 48, and their son Pax, eight. 

It's official: Angelina Jolie and Brad Pitt,  seen here on Wednesday at the Los Angeles County Museum of Art, have confirmed they are engaged

Sparkler: The first glimpse of the actress' new diamond, estimated to be worth around $250,000

A spokesperson for the jeweller announced the news to the world, saying: 'I can confirm that, yes, Robert Procop did indeed design an engagement ring for Angelina Jolie, designed in collaboration with Brad Pitt.'

Procop said: 'Brad had a specific vision for this ring, which he realised over a yearlong collaboration. He wanted every aspect of  it to be perfect, so I was able to locate a diamond of the finest quality and cut it to an exact custom size and shape to suite Angelina's hand. 

He continued: 'Brad was always heavily involved, overseeing every aspect of the creative design evolution. 

'The side diamonds are specially cut to encirlce her finger. Each diamond is of the highest gem quality.'

Experts estimate the ring cost around $250,000.

Angelina's father Jon Voight was among the first to publicly congratulate the pair, telling Us Weekly: 'I'm very happy for them.'

  

Power couple: The Hollywood pair, pictured together here at the Oscars in Los Angeles back in February, have been together for seven years

Angelina has been married twice before - to British actor Jonny Lee Miller between 1996 and 1999 and then Billy Bob Thornton, from 2000 to 2003.

Brad's marriage to Jennifer Aniston lasted five years before they announced they were divorcing in early 2005 - which came after he had met Angelina on the set of Mr & Mrs Smith.

Brangelina - as they became known - quickly became a Hollywood power couple, with a brood of six children; five-year-old Shiloh and twins Knox and Vivienne, aged three, along with three adopted children Maddox, 10, Pax, eight, and Zahara, seven.  

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Showing her appreciation: Angelina was wearing the ring during her visit to the museum on Wednesday, where she looked at significant works from the LACMA's art collection

Delightful day: The couple mingled with fellow guests and enjoyed a buffet of drinks and food laid on

The couple once insisted they wouldn't wed until the legalisation of same-sex marriage in America.

MEET THE MAN WHO CREATED ANGELINA'S DIAMOND RING

Beverly Hills jeweller Robert Procop worked closely with Brad Pitt on the engagement ring for more than 12 months. He has been the private jeweller to Angelina Jolie for over a decade and collaborated with the actress for Style of Jolie – a jewellery collection auctioned off for charity last year. He is the former CEO of Asprey & Garrard, the British jewellery firm which has worked with the English royal family.

But Brad recently admitted he didn't feel they'd be to wait that long because of mounting pressure from their children.

'It seems to mean more and more to our kids,' he said in January. 

'We made this declaration some time ago that we weren't going to [get married] till everyone can. But I don't think we'll be able to hold out … it means something to me, too, to make that kind of commitment.'

Angelina has also said that their children often ask why they aren't married like 'Shrek and Fiona'. 

She said just months ago: 'We've explained to them that our commitment, when we decided to start a family, was the greatest commitment you could possibly have.

'Once you have six children, you're committed.'

Their high-profile romance has made headlines since sparks first flew on the set of Mr & Mrs Smith back in 2004.

There was intense speculation they started up a relationship while Brad was still with his then-wife Jennifer Aniston.

Brad and Jen announced they were divorcing in early 2005 - but it wasn't until early 2006 that Angelina and Brad acknowledged their relationship when the actress revealed she was pregnant. 

In October 2008, Angelina told The New York Times that her children loved Mr & Mrs Smith because: 'Not a lot of people get to see a movie where their parents fell in love.'

Happy family: 'Brangelina' have six children, three biological and three adopted, seen here in New Orleans in March last year

However, the actress has maintained that she and the heartthrob remained nothing more than friends until after Pitt and Aniston announced they were divorcing.

She once said: 'To be intimate with a married man, when my own father cheated on my mother, is not something I could forgive. I could not look at myself in the morning if I did that. I wouldn't be attracted to a man who would cheat on his wife.'

Angelina also said in a 2006 interview with U.S. Vogue that when she met the actor, she had not known 'exactly where Brad was in his personal life.'

She said: 'But it was clear he was with his best friend, someone he loves and respects. And so we were both living, I suppose, very full lives.

Chemistry: The pair met on the set of Mr & Mrs Smith, which was released in 2005

'Brad was a huge surprise to me,' she added. 'I think we were the last two people who were looking for a relationship. I certainly wasn't. I was quite content to be a single mom.'

The star also said that she and Brad had taken a 'long time' before deciding to embark on a relationship.

'We spent a lot of time contemplating and thinking and talking about what we both wanted in life and realised that we wanted very, very similar things,' she said.

Former flames: Angelina previous two marriages both lasted just three years, left with first husband Jonny Lee Miller, centre, with Billy Bob and, right, Brad Pitt and Jennifer Aniston, who he was married to for five years 

'And then we just continued to take time. We remained very, very good friends - with this realisation - for a long time.

Angelina sought to explain how the film, a romantic comedy action film, had 'brought' she and Brad together.

'Because of the film, we ended up being brought together to do all these crazy things, and I think we found this strange friendship and partnership that kind of just suddenly happened,' she said.

'I think a few months in I realised, "God, I can't wait to get to work."'