Romance rumors circulated after Kylie and Alexander shared a holiday in Chile.

Alexander was supposed to be in Chile, his home country, scouting filming locations

Now according to NW, evidence is mounting up, friends say a frustrated Laura grew increasingly suspicious and upset.

"She went absolutely berserk," says a pal.

"She is eight months pregnant and had been looking after their three-year-old son Matias while he was gallivanting across Chile."

"He decided it was best to stay at his mum's while [Laura] cooled down," says the pal.

Alexander's friends confirm his relationship with Kylie has endangered his marriage and looks set to create more disruption for the director.

"Alex said he and Kylie were having a 'phone romance'," says a friend. "This friendship is going to cause trouble."