Alanna Masterson and boyfriend Brick Stowell are expecting their first child.

The 27-year-old actress revealed the news with a baby bump photo Monday on Instagram. "Guess what... @brickstowell" she captioned the picture.

Stowell followed up by posting a selfie with Masterson on Tuesday, writing, "Baby Season." The actress shows off her growing belly in a bikini in the black and white snapshot.

Masterson is sister to Last Man Standing actor Jordan Masterson, and half-sister to actors Danny Masterson, Christopher Masterson and Will Masterson. The actress is best known for portraying Tara Chambler on AMC series The Walking Dead.