It was never that serious: Sienna Miller on her relationship with Rhys Ifans

Rhys Ifans is said to be devastated by their split but in a move likely to cause the actor further heartache, Sienna Miller has claimed that they 'were never that serious'.

In a recent interview, the actress hints at her split with the Notting Hill star, admitting that she isn't ready for marriage.

'I really thought I was very ready to settle down, but then I realised I wanted to be selfish for just a little bit longer.

'When I have a child, it will be probably become my whole life, so I don't want to have any regrets that I should have done more. But I'm only 26, I have plenty of time,' she said.

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Split: Sienna Miller (right) pictured arriving at the Radio One studios yesterday. She has spoken about her relationship with Rhys Ifans, saying it was 'never that serious'

Her former lover has since been spotted moping around London looking like a broken man but Miller is clearly taking their break-up in her stride.

The actress appeared on LK Today with her friend and co-star Keira Knightley to promote their movie Edge Of Love and the pair spent most of the time giggling with each other.

Ifans is reportedly homeless, after selling his house to move in with the actress, and has been sleeping at friends' houses since their split earlier this month.

Celebrity pals such as model Kate Moss have been rallying around the star and are said to be increasingly concerned about his state of mind.

Sienna Miller in happier times with former boyfriend Rhys Ifans last year

The 26-year-old has already moved on from the relationship and is said to be dating her former lover Brothers And Sisters star Matthew Rhys – who also stars in the film about the life of Welsh poet Dylan Thomas.

Miller also speaks about her friendship with her Casanova co-star Heath Ledger - who died from a prescription drugs overdose in January - in the revealing interview with the Telegraph Magazine, confessing that she has kept a pair of his pyjamas.

'Heath and I had this amazing night out in Venice with my mother.

Giggles: Sienna Miller laughing with Keira Knightley during an appearance on LK Today

'It had been pouring with rain. Heath ran out in the middle of St Marks square and we were running around, and I slipped over.

'We all ran back to his and he gave me these dry pyjamas to get home in.'

She kept them for two years until Ledger came to visit her a few months before he died.

'When he came over to my house last November, and he was having trouble sleeping, I gave them back, to help him sleep.

'When he died, I was so sad that I didn't have these stupid pyjamas anymore, so his father found them to give to me,' she said.