"Oh my goodness it seems the stork is visiting us again!" The 38-year-old wrote alongside a string of heart and rainbow emojis.
"I am growing another little Tyler Gardner in my belly. Our family is growing! So grateful @davidgardner I love you."
Tyler posted a black and white snap of herself in a strappy black dress holding her belly and smiling away from the camera.
Her husband was just as excited as it wasn't long before he posted a photo of his wife displaying her bump with a beach background.
"My beautiful baby is pregnant," he wrote on the caption. "Sooooooo excited and so blessed, I love you @misslivalittle."
Tyler is already mum to 11-year-old Milo from her previous relationship with Royston Langdon.
She confirmed she was pregnant with her second child in September 2014 with partner David Gardner. Tyler gave birth to her son, Sailor Gene, six weeks early in February 2015.
Amidst the pregnancy announcement, Tyler and Gardner have both been posting family snaps from their beach holiday with Sailor and Milo.