Hi dear, i found this ebay listing which is exactly like your bag. I'm no Celine expert but at least this is proof that a similar one exists.
http://www.ebay.com/itm/NWT-Authent...bags&hash=item20c7919207&_uhb=1#ht_500wt_1287
http://www.ebay.com/itm/NWT-Authent...bags&hash=item20c7919207&_uhb=1#ht_500wt_1287