The actress' Stone Ridge, New York estate will be the setting for sister Jennifer's upcoming nuptials, and Seyfried is beginning to get a little anxious about the party.

She tells Marie Claire magazine, "My sister's wedding will be fun, but I fear everyone is going to get too drunk. I said to my brother-in-law, 'So, we're just going to do wine and beer, right?' and he's like, 'No, a full bar...' I'm like, 'Nooo!' I don't want people to trash my property or f**k with my horses.

"Isn't it crazy that's what I'm worried about?"

The big day might inspire the actress to consider her own wedding to longtime boyfriend Justin Long, but she admits at the moment there are no plans for them to tie the knot.

If that changes, she insists her ceremony will be an intimate affair.

She adds, "You never know how committed you are when you're (both) always working; it's just a good feeling to know that you love each other. That's the most important thing. It's like, 'Are we here?' We love each other, we respect each other, and it's a nice place to be. I just don't want the big wedding.

"My sister's wedding is going to be so much better, because none of the attention will be on me."