This is the £10 million townhouse that actress Sienna Miller and her toyboy lover have chosen as their new family home in fashionable west London.Sienna, 44, who is currently starring alongside Dominic West in Sky’s hit divorce drama series War, has splurged on the house as a permanent base for her growing family.The sprawling three-storey Edwardian house will provide a base for Sienna and her fiancé Oli Green, 29, whom she has been dating for five years and to whom she is now engaged.Sienna gave birth to her second child with Oli in April, a baby boy, while the couple also have a three-year-old daughter and Sienna has a 14-year-old daughter Marlowe from her previous relationship with actor Tom Sturridge, 40.She had been looking for a home to bring the children up in and has settled on the seven bedroom house on a quiet backstreet of a trendy west London neighbourhood.It was sold through a private estate agent in a transaction as first revealed by the Mail’s Richard Eden this week. Sienna Miller’s Instagram page gives an insight into the stunning London home she’s bought The star, 46, has posted family photos of her partner Oli Green, 29, strolling around the area Sienna has posed for pictures in the stunning garden of the sprawling place she bought in June The three-storey Edwardian house will provide a base for Sienna and her partner of five years Sienna has already shared pictures of parts of the house and garden as well as family strolls around the area on her social media.The property has undergone extensive modernisation but retains its double fronted exterior and elegant charm.There is a secluded garden at the back and a chess board floor style terrace as well, with wooden floors throughout.Publicly available Land Registry records reveal Sienna as the sole owner of the chic house which was bought in June with costs thought to have pushed the final price closer to £10 million.Her new neighbours included former Chancellor turned British Museum chair George Osborne while Ex PM David Cameron also owned a house a few minutes walk away before moving full time to the Cotswolds. Oli and Sienna saw the home as the perfect place to raise their two children; a daughter, who will be three next month; and a boy born in AprilSienna had spent several years in New York as her acting career took off in the US but finally decided she needed to be closer to family and friends in the UK and sold her four-story town house in Manhattan’s West Village three years ago for $5.3 million.Sienna also owned a £2 million thatched cottage in rural Buckinghamshire for two decades but is now thought to have sold that too to help fund the Notting Hill move.In hit show ‘War’, Sienna is seen battling onscreen billionaire husband Dominic West for an eye watering divorce settlement.She is currently promoting her new film Madden, attending its Californian premier with co-star Christian Bale.The actress, 44, wore a vintage pink satin ruffled minidress for the screening, which was styled with a pair of barely-there strappy heels.The mother-of-three plays Carol Davis, the wife of Las Vegas Raiders owner Al Davis in the film.Oli popped the question to New York-born Sienna while on a walk in Central Park during their final months in the US soon after the birth of their son.Detailing the proposal, while on the Jimmy Fallon show, she said: ‘[We] went for a walk in Central Park….[Oli] popped the old question.’ The actress, who is currently starring in the hit TV series ‘War’ alongside Dominic West, is the sole owner of the property, land registry documents show Sienna, who first found fame in the 2004 films Layer Cake and Alfie starring opposite Jude Law, was at first delighted to be in New York, and away from what she termed the ‘cliquey’ social scene of London.But she began to miss home to the extent, she said, that she was ‘sort of hanging out by the baked beans in the English shops’.She was famously previously engaged to Law, 51, but the pair split in 2005 after he publicly revealed he had been having an affair with one of his children’s nannies.In those days she and Law were part of the so-called Primrose Hill set – now she will be one of the most famous faces in the Notting Hill set.