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It's Marc Jacobs but I'll post a few similar ones for you :)
dress: 750£ renttherunway.com
dress: 3£ cgi.ebay.co.uk
dress: $1441 forwardforward.com
This one's Moschino Cheap & Chic. Maybe you can still find it somewhere.
dress: $100 4.bp.blogspot.com
dress: 31€ etsy.com
dress: 18€ asos.fr
dress: $36 / Vero Moda asos.com
dress: $83 / Asos asos.com
It's Catherine Holstein