Sienna Miller and her married boyfriend Balthazar Getty are moving out of the honeymoon phase and into the rough patch, according to reports.

The couple – who were caught looking loved up only a couple of months ago in Italy – are rumoured to be feeling the strain on their heavily criticised relationship.

The Brothers and Sisters actor is also reportedly stalling on his divorce from Rosetta Millington and not prepared to move away from his children – much to the dismay of disgruntled Sienna.

A pal tells the Mirror, “They had such an animal attraction in the beginning.

“As well as the divorce, they are bickering over where in the world they are going to live and Sienna’s love of partying."

The source adds, “She’s only 26 and loves to go out. But Balt is a former drug and alcohol addict who is now teetotal.

"It’s tough trying to get a balance.”

See Sienna's weird Halloween costume here