Golfer Monty's fiancee flashes her huge diamond engagement ring

Posing together, both dressed in simple plain shirts, Colin and Gaynor both appear blissfully happy following her acceptance of his proposal of marriage.

Montgomerie's impending marriage to fellow Scot and wealthy widow Gaynor received the full endorsement of his children, after he got down on one knee to ask for the hand of his new love.

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She accepted and the couple plan to marry next year.

Both Colin's three children from 14-year marriage to ex-wife Eimear and Gaynor's four children from her marriage to Scottish furniture tycoon George Knowles Jnr are delighted by the couple's plan to wed.

A friend said: "The children all get on very well and are thrilled about it. Gaynor and Monty are deeply in love."

Gaynor's first husband died of a heart attack in 2003 on a yacht off Majorca as he celebrated his 41st birthday. She was left a £20 million fortune.

Colin, 44, proposed while dining with Gaynor at Gleneagles Hotel in Perthshire, having already consulted his children about his marriage plans.

Ex-wife Eimear told Daily Mail columnist Richard Kay: "He told the children about it before-hand and then asked them to keep it secret until after he had proposed - and they did."

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The couple divorced three years ago, with Eimear citing unreasonable behaviour due to Montgomerie's obsession with his sport.

Eimear, 37, who also has a new partner, self-made millionaire Nick Cook, 55, said: "I haven't met Gaynor but I am told by the children that she is very nice and they like her a lot."

Montgomerie admitted in his autobiography, that he brought the pressures and anxieties over his career home and failed to give his family enough attention, which contributed to the collapse of his first marriage.

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The stress of the breakdown caused havoc with his game. At the time of his £8 million divorce Monty said: "It's impossible to exaggerate just how much of an effect a period of stress like the one I experienced during my divorce can have on you."

But friends say Colin has learned his lesson and will hopefully be more philosophical about his golf this time.

Last month, he won the European Open in Ireland and next weekend he is playing in the Johnnie Walker Championship at Gleneagles, where he is also chairman of the championship.