Absolutely beautiful, a good starting point may be to check out Didot, Bodoni or maybe even Ambroise... but I wish I knew this one cause I love these kind of fonts (my guess it's custom).
I'd love to know this font!! I think I've seen it somewhere else being used but I cannot recall!! If anyone knows this, please share with us some light!!
this is very similar to Didot Light Roman (96 pt), but there are still some differences, for example the letter R is very different..but still very very similar
Captured from commoncrawl.org on 20 Apr 2015. original URL