The 30-year-old actress took to Instagram and posted an adorable photo of her 2-year-old son, Bodhi, pulling his mother's shirt up to kiss her baby bump while Webber looks at the camera as he leans in to kiss Bodhi's head.
"And just like that my heart grew bigger ❤️✨ Welcoming baby number 2 in to the family," the Warm Bodies star wrote. "Can't believe our little Bodhi is going to be a big brother! ?�� @likemark"
Prior to Bodhi's arrival in 2014, Palmer posted a sweet message on Instagram, along with a sonogram image of her baby and a pair of slippers. "To my precious baby - I'm so blessed to be your mama, we have been wishing for you for awhile," she wrote. "We love you so much and can't wait to kiss your little face and tiny toes. Thank you for hearing our prayers."
Palmer and Webber first met in 2012 and married in December 2013 in Mexico.
Earlier this year, ET caught up with Palmer to discuss her movie,The Choice, the latest Nicholas Sparks adaptation.
"I kind of geeked out about it because I was a huge The Notebook fan," Palmer admitted. "I feel like I manifested this role. It was my dream to one day be in my own Nicholas Sparks movie. So it's cool."
Palmer's co-star, Benjamin Walker, admitted some of the movie's more passionate scenes were a bit difficult for their respective spouses to watch.