The former Home and Away star is expecting her first child with her husband, advertising executive Andrew Moggs.
"There just aren’t the words to describe how happy we are right now!!" Anderson, 38, wrote on Instagram.
"We are so excited to welcome BABY MOGGS into our lives. So in love with this beautiful little soul already ❤️"
Anderson, known for playing Charlie Buckton in the long-running Channel 7 soap, married Andrew in her hometown of Geelong, Victoria in February 2017.
Congratulations to the parents-to-be!