Melanie Griffith is a proud mum after learning her daughter Dakota Johnson has landed the lead in the movie adaptation of E.L. James' scandalous novel Fifty Shades Of Grey.

James herself announced the casting on Monday (02Sep13), revealing Charlie Hunnam would be playing Christian Grey opposite Johnson's Anastasia Steele, and Griffith jumped on Twitter to celebrate.

She wrote, "My beautiful child Dakota has been chosen to play Anna Steele in 50 Shades. Look out world! Here she comes!!! #proudmama."

Meanwhile, producer Michael De Luca has revealed the pairing of Hunnam and Johnson was easy to pick as there was "incredible chemistry" between them.

He says, "Auditions were stunning."

The Fifty Shades of Grey movie will open next summer (Aug14).