Sienna Miller is going through her “first serious rough patch” with boyfriend Rhys Ifans over her friendship with fellow actor Sean Penn.

Despite reports the couple would marry this summer after over a year together, Sienna and Rhys spent much of their recent break in Los Angeles discussing their relationship after being reunited for the first time in three weeks.

With the pair currently filming new movies in different countries Rhys has reportedly become unsettled by Sienna’s recent meetings with Penn, including an appearance together at the Coachella music festival last month.

A source tells the Mail On Sunday, “Rhys can be quite jealous and he doesn't like Sienna hanging out with other guys, especially Sean who she seems to have a serious crush on.

"She also had lunch with Matthew Rhys in LA in March. They used to date and Rhys is very insecure about him. He wasn't happy they'd met up.

"It has been very strained and things are very sensitive at the moment.

"They are not over, but Sienna has made some tearful long-distance calls to Rhys and has confided to some of the cast on her movie that things aren't great."