Sienna Miller is dating Matthew Rhys

It has been reported that actress Sienna Miller is dating her "Edge of Love" costar Matthew Rhys. The couple apparently fell for each other on the set of said film, and their romance was encouraged by their co-star Keira Knightley.

The "Brothers & Sisters" star and Sienna Miller kept their budding romance under wraps for as long as possible, but are now making their relationship known.

Rumorsthat the British actress and rapper P. Diddy are dating have been laid to rest by the news. This is the first bloke Sienna has been serious with since she finally split from Jude. These vicious allegations of her being with Sean 'Diddy' Combs and splitting up his relationship with Kim Porter are awful," a source said. "But they have actually worked in her and Matthew's favor a bit. It has taken the heat off their relationship."

The source continued to discredit rumors that Miller was ever romantically involved with Diddy saying, "Sienna and Diddy are party pals. They love to go out and have a good time but that's where it ends, they have had some wild nights in Los Angeles, London and St. Tropez but he isn't someone she is going to take home to her mum."