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It's definitely a Clare Vivier bag, it's called the "Tropézienne" and you can find it on several websites, it's a great bag!
bag : $386 / Clare Vivier shopprettymommy.myshopify.com
This a Stéphane Verdino's bag (he's a french designer).
bag : 250€ sarenza.com
bag : 99€ stephane-verdino.placedestendances.com
It exist on black or white too.
bag : 220€ erotokritos.lexception.com