The pair, who wed in 2011, told People Magazine the news, "We are so excited to announce that we are expecting our first child together. Having a family has always been a priority for us both and we couldn’t be happier!"
Eva later posted on Twitter, "Happy Valentines day to my heart, my hero, my BABYDADDY @kylemartino!!!! I love you so much."
Sarandon tweeted her own thoughts on the announcement, posting, "Ecstatic bout the new addition to our tribe. Thx @4EvaMartino & @kylemartino. Looking forward to being a grandmother."
A few hours later Eva shared, "First family road trip with the little Sweet Pea! Desert, here we come!!!"