Sienna Miller sported a painful-looking bruised eye as she posed for a selfie in her bathrobe after taking a shower on Monday.The actress, 44, showcased her injury on Instagram while covering her mouth with her hand following a mystery accident.Sienna, who is engaged to fiancé Oli Green, flashed her dazzling engagement ring in the snap before heading out for a date day.The couple looked smitten as they enjoyed a day out together with their baby son. They also share a two-year-old daughter.Sienna also has a 14-year-old daughter, Marlowe, with her ex Tom Sturridge. He recently got engaged to Alexa Chung.Oli proposed to Sienna during a walk in Central Park shortly after she giving birth to their second child together. Sienna Miller sported a painful-looking bruised eye as she posed for a selfie in her bathrobe after taking a shower on Monday She also posted a rare snap of her baby son, who she shares with fiancé Oli Green on a sweet day out togetherAppearing on Jimmy Fallon’s The Tonight Show, Sienna revealed that Oli popped the question the day after she was last on the show on May 14 – three weeks after giving birth.Detailing the proposal, she said: ‘[We] went for a walk in Central Park, popped the old question.”And you just had the baby,’ Jimmy said.’Yeah, I was not looking my best,’ Sienna laughed before Jimmy asked: ‘Wait, did you know it was going to happen?’She replied: ‘No, not in the slightest. And when I kind of got the feeling something was up, I was like, “Please God, not now”.’I had the greasiest hair, sort of stains on the T-shirt. It was, yeah, it was full postpartum beauty.Jimmy said: ‘So a nice romantic stroll and you’re like, “Oh this is cool”.’Sienna continued: ‘Yeah and then, “Why is he being weird?”. Suddenly, chat, chat and then quiet and a bit sweaty-palmed.’I was like, “Please God no”. I was like,”Ooo this is romantic.” Oh like, you know, “Look at the birds”, you know. Sienna and Oli looked smitten as they posed for a loved-up selfie Sienna also has a 14-year-old daughter, Marlowe, with her ex Tom Sturridge (pictured together in September)Sienna then went on to reveal that the pair met at a Halloween party while she was dressed as David Bowie.She said: ‘And then we got together seven years later at the same Halloween party, isn’t that weird?’Confused, Jimmy asked: ‘Wait. Explain?’Sienna clarified: ‘When we met, we didn’t get together. And then seven years later at the same Halloween party, it was where we first smooched.”Wow! That’s special,’ Jimmy gushed.