Keira Knightley ridiculously mature for her age, says pal Sienna Miller

London, Mar 23 (ANI): Sienna Miller has claimed that her pal/actress Keira Knightley is 'ridiculously mature for her age'.

The 27-year-old, who became firm friends with Knightley on the set of Dylan Thomas biopic 'The Edge Of Love', suggests the latter is deceptively boring whose idea of fun is staying in and completing a crossword.

"She's ridiculously mature for her age. I am 12 compared to her, " the Daily Express quoted Miller, as saying.

"We lived in a house in Wales together (during filming). We'd play cards, do crosswords, that kind of thing," she added. (ANI)