The romance being Sienna Miller and Rhys Ifans looked to be hotting up as they enjoyed a romantic date at the Ivy together.

Miller – wearing a leopard dress – smiled for photographers as she headed home with her new man.

Rhys had earlier avoided questions about their relationship at the premiere of his new movie Elizabeth: The Golden Age by arriving alone and refusing to talk to the press.

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Happy couple: The pair were all smiles as they headed home together, both have refused to confirm that they are an item

Sienna and Rhys enjoy a night out at the Ivy restaurant

The party loving pair have always insisted that they are nothing more than friends, but recent pictures of them kissing in public made it clear they're an item.

They were first spotted together in Ibiza in August, and Sienna has kept up a hectic pace of wild partying with Rhys on the London social circuit ever since.

Rhys, 39, recently got a swallow tattoo on his wrist to match the one Sienna already had on hers.

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Sienna's ex Jude Law is said to be going to great lengths to avoid bumping into the couple

Meanwhile Sienna's ex-fiance Jude Law is said to be devastated by the blossoming relationship.

Jude was reportedly hoping to get back together with the actress and was crushed when he discovered she was dating his Rhys – who is one of his best friends.

Friends say he is going to great lengths to avoid bumping into the couple on the London party scene.