Erin Foster has been cooking up a Thanksgiving surprise.

The TAIM Exchangeactress and writer is pregnant with her and husband Simon Tikhman's first baby. The daughter of musician David Foster announced the news Nov. 23, Thanksgiving Day, with a photo showing herself showcasing her baby bump in a white top and baggy black pants while standing in a yard with Simon, sitting on the grass and smiling.

"It feels like we need something positive right now, so I'd like to offer something," Erin, 41, captioned the Instagram post. "I'm pregnant!"

Simon commented, "Me too!"

Erin also talked about her pregnancy on the Nov. 23 episode of her and her sister Sara Foster's podcast The World's First Podcast with Erin & Sara Foster, during which she revealed she and her husband of more than three years are having a baby girl and already have a name picked out for her.

Meanwhile, Erin received a slew of well-wishes from fans and fellow celeb moms on Instagram. "Erin!! I am so happy for you two!!" Courteney Cox commented on her post, "This is the best news ever."

Rachel Zoe wrote, "I just started crying immediately...I am so happy I any breathe @erinfoster @simontikhman," while Jennifer Garner commented, "Erin!!!! Such welcome, happy news!! Congratulations!"

Erin and Simon's upcoming arrival will join her large extended family: Her dad and his fifth and current wife Katharine McPhee are parents to son Rennie, 2. David, 74, shares daughters Erin, Sara—a mother of two—and Jordan Foster, 37, with second ex-wife Rebecca, and daughter Amy Foster, 50, with first ex-wife B.J. Cook.

Erin's pregnancy announcement comes more than three months after she sparked pregnancy rumors with a cryptic Instagram post.

"Can you imagine how insane I'm going to be as a MOTHER!?" Erin captioned a plane selfie with a crown emoji over her head.

She then clarified in another pic: "Guys I'm not pregnant. I said WHEN!! Delete all your nice DM's to me."

For the latest breaking news updates, click here to download the E! News App