The Last Word star posted a photo of the two sitting on top of interactive rocking horses with their dog, Finn, by their side. In the pic, Seyfried is adorably staring at her beau, seemingly in awe of his wildly good looks.
"Still can't take my eyes off you," the 31-year-old actress captioned it. "Happy Birthday to the man of my life."
"I'm blown away by her every day," added Sadoski. "She does look about ready to pop. It's a pretty amazing thing. I just get to sort of hang back and watch it all happen. That's the great joy for me, trying to learn as much as I can -- try to stay out of the way and not screw anything up too much."