Sienna Miller was reportedly dumped by boyfriend Jamie Burke because he didn’t like how close she is getting to new co-star Matthew Rhys.

Sienna admitted she and Jamie had split up last week and a source has now claimed the break-up was brought on by Sienna going on a ‘date’ with Matthew.

The source told Star magazine that their other Edge of Love co-star Keira Knightley invited Sienna and Matthew to dinner with her and her boyfriend Rupert Friend: “She thought she was doing Sienna a favour. Keira and Matthew are old friends and she thinks he’s a great guy and knows how well he treats women.”

“Sienna and Matthew were giggling and carrying on like they were on a date all by themselves. She has gushed to Keira about how great he was.”

This isn’t the first time Sienna has been romantically linked to a co-star - she was linked to Factory Girl leading man Hayden Christensen and then to Camille’s James Franco as well as her long on-off relationship with Jude Law after acting opposite him in Alfie.