Looks like Sienna Miller is rebounding from her relationship with older man (by 9 years) Jude Law with 50-years-older Martin Landau! The two were chattin' it up outside the Ivy yesterday (Sharon and Sienna in one day - this guy gets around!), before she headed over to Soolip Paperie on Melrose. After that, she returned to the Chateau Marmont, where Sienna had dinner with some girlfriends...no Martin in sight!