Where online can I buy a white dress like this? I saw it on a Leann Rimes poster downtown. I think she looks really pretty in that white dress.

I wanna wear the same dress as Leann Rimes. Please can someone link me to where I can buy that same white dress as her? She is a mature, hot, sexy, beautiful and good looking girl/woman. Thank あなた for all the help. 🆘