Rhys Ifans issues marry-me-or-it's-over ultimatum to Sienna Miller

Rhys Ifans has reportedly issued a marry-me-or-it's-over ultimatum to Sienna Miller during a recent romantic trip to New York.

Sienna and Rhys were on a make-or-break holiday when the Welsh acor insisted they should announce their engagement - or end the relationship.

"Rhys is fed up with all the secrecy around their relationship and wants to make it a permanent thing," says a source.

"He has asked Sienna to marry him and it's the last time he will ask. He wants everyone to know they are officially an item."

But the engagement ring remains in the box. "Sienna has yet to make a decision and Rhys can't understand why," adds the source.

"Sienna's always trying to avoid the official relationship topic and is happy to keep it a low-profile affair.

'Notting Hill' star Rhys, 39, and 'Factory Girl' actress Sienna, 26, were first spotted as a couple on holiday together in Ibiza last August

"Rhys has been happy with that but now feels they should decide whether it's going to be long-term or not. They were in Gramercy Park Hotel on Sunday, drinking cognacs with soda.

"Sienna paid - it was as if she had some making up to do."

Sienna's rep said the pair had both been in New York for work reasons.