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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