Sienna MillerRhys Ifans has reportedly planning to propose to girlfriend Sienna Miller during her birthday night out this evening.

Rhys is said to have commissioned a special ring to present to his girlfriend of six months to celebrate her 26th birthday tonight but friends of the couple believe it’s more than just a birthday present.

A source close to the couple told the Sun: “Sienna is having a bit of an age crisis, feeling that she hasn’t done enough with her life.”

“So Rhys, whose philosophy is to live and enjoy every day, has penned a poem about their brilliant future together, all her achievements in life so far and always seizing the moment.”

“He’s collected ten presents for Sienna of varying shapes, sizes and prices. They are all part of his plan for a romantic night in with a mountain of presents.”

“He is keeping tight-lipped on a proposal but hinted to me that he has had a Welsh designer craft a special ring for her… which can only mean one thing.”

The inseparable couple spent part of Christmas with Rhys’ family in Wales and Sienna impressed the Notting Hill star by wishing him seasons greetings in Welsh after she pledged to learn the language for him.