New ad campaign couple alert!
Burberry refused to confirm or deny the rumor, but it's probably not a coincidence that they both attended the opening night of Tom's Broadway play Orphans last week wearing the British label.
Sienna's also really good friend with the Burberry's creative director Christopher Bailey and even went to the Met Gala as his date in 2006, so they probably didn't have to do much convincing.
Unfortunately everyone's staying mum on the subject, so we'll have to wait for the ads to leak to see if this rumor is true.
[Image via Joseph Marzullo/WENN.]