Brian,
I agree with Larry, Karen and Donald that yours is not Wild Horses. Moonlit Masquerade is certainly an option. With the info that you purchased it through a mail order site (many of us make this mistake at first, me included
), my additional guess is Modern Design. There are just many with this coloration so it will be difficult to know for sure!
Here is one of my pics of Modern Design
Moonlit Masquerade (usually petals are more creamy white, but we had a weird spring)
And a comparison of Wild Horses:
