"Celebrating our next family member today. First for my bro Wy and @merediththeweasel. We are are over the moon and can't wait!!!!" Hudson said alongside an image of herself placing her head on Hagner's baby bump.
Hudson and Hagner appear to be celebrating at a baby shower in the photo, which also features balloons in the background.
Wyatt Russell, 34, and Hagner, 33, got married in Aspen, Colorado in September 2019.