May 01, 2012 01:00 PM

Jason Merritt/Getty

After eight years together and a three-year engagement, Cobie Smulders and Taran Killam are finally tying the knot this September.

And no one is more excited to go dress shopping than the couple’s daughter Shaelyn Cado, who turns 3 this month.

“She really wants a dress and she wants white shoes,” The Avengers actress, 30, tells ET Canada.

As the big day draws near, the guest list is being finalized — with Shaelyn taking charge of double checking the invitees.

“If people come over she’ll be like, ‘Mama, are they coming to the wedding?’ Usually it’s a yes,” Smulders shares.

But, most importantly, the toddler has learned a valuable lesson: a big party means a whole lot of delicious desserts.

“She knows about [the wedding]. She knows that there are sweets involved,” the How I Met Your Mother star laughs.

— Anya Leon

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