Sienna Miller and her The Edge of Love costar Keira Knightley had a girls' night out in London yesterday. They dined at Bocca di Lupo in SoHo as news broke that Keira's relationship with her longtime boyfriend Rupert Friend officially ended after speculation about a possible split last month. Sienna's dealt with her own drama before, but she's currently going strong with her on-again partner Jude Law. The couple spent the holidays together and celebrated Sienna's 29th birthday with a trip to Kenya. They also recently bought a gorgeous new home, fueling rumors that they may be ready to make things official with a wedding.