Sienna Miller gets cosy with her co-star!

Sienna Miller couldn’t keep her hands off her co-star at the premiere of her new movie on Thursday.

The actress was seen gazing into Matthew Rhys’ eyes at the Edinburgh premiere of their film The Edge of Love.

Sienna, who recently split from Welsh actor Rhys Ifans over his alleged jealousy of her close relationship with Matthew, briefly dated Matthew last year.

An onlooker said: “They looked really close. They had their arms around each other and didn’t care about the cameras.”

The pair first met when filming first started last year on The Edge of Love, which is about Welsh poet Dylan Thomas.

Meanwhile, Sienna has landed the role of Maid Marian in a new Robin Hood movie.

The gorgeous star will be romancing the legendary thief in a twist on the traditional tale, directed by Ridley Scott.

She said: “It's happening. I just found out. It's the most exciting news in the world.”

Russell Crowe – who teamed up with Ridley for Gladiator in 2000 - is also set to star in the remake as the Sheriff of Nottingham.