( dailymail.co.uk ) - It may be the union of two of the world's sexiest people, but the high-profile 'Brangelina' love affair is on the brink of collapse, according to reports in the US.
Sources say the relationship between Hollywood stars Angelina Jolie and Brad Pitt has already "fallen apart", but they are staying together for the sake of their four young children.
A friend said: "They aren't making each other happy. But they want to put on a show of togetherness for the children.
"Their romance has fallen apart. They've turned into two people staying together for the sake of their kids."
The couple, who first met on set of Mr and Mrs Smith in 2005, have a 14-month-old daughter, Shiloh, as well as three adopted children, Maddox, 6, Pax, 3, and Zahara, 2.
Pitt's relationship with his former wife Jennifer Aniston is said to be a source of tension for the couple. The Friends star has also maintained a strong relationship with Pitt's family since the divorce and his mother Jane even visited Aniston at her Malibu home last month.
His brother Doug explained: "Jennifer is a friend of Brad's, why wouldn't she be a friend of ours?"
Jolie's demanding ways, which reportedly sparked arguments while the couple were living in Prague earlier this year, have also taken their toll. A friend said: "Brad's had enough of doing what Angie wants to do and following her around the globe. But they still have to live close to each other for the kids."
The couple recently holidayed in France in a final attempt to salvage their romance, according to sources.
An insider told InTouch magazine: "They had hoped the trip would be a fresh start for them. But after a few days, they were at each other's throats."
While they consider their long term future, the couple have already begun living separate lives, says one associate: "He likes to take off on his motorcycle when the strain of living with her gets too much.
"Angelina is worried that Brad might jut keep going one day and leave her for good" Pitt's spokesperson has so far not commented on the reports.