And the actress, 38, shared the good news with her social media family on Friday (8 January) in THE cutest way.
The Leftovers star posted a black and white snap of herself beaming with happiness and showing off her growing baby bump.
Alongside the photo, she told her 816,000 followers: "Oh my goodness it seems the stork is visiting us again !!!! I am growing another little Tyler Gardner in my belly. Our family is growing!!! So grateful. @davidgardner I love you."
Her fiancé Dave Gardner, best friends with David Beckham, also told his fans their happy news.
Sharing another stunning snap of pregnant Liv at a beachside location, the famous football agent wrote: "My beautiful baby is pregnant !!!! Sooooooo excited and so blessed, I love you @misslivalittle X."
Fans were quick to congratulate the A-list couple, with one writing: "Congrats! You guys don't waste any time haha."
Another said: "Absolutely gorgeous woman congratulations to you both too."
One told Lord Of The Rings star Liv: "Congrats! You make looking pregnant and bouncing back look easy. It works on you."
And one hoped for a girl, adding: "Congrats!! So excited for you!!! Hoping for a healthy baby but secretly hoping for pink for you xoxo."
The new baby will be Liv's second with Dave after they welcomed 11-month-old son Sailor Gene last year.
Not only does Sailor has very cool parents, he also has David Beckham for a godfather!
Liv also has 10-year-old son Milo from her marriage to musician Royston Langdon, while Dave has son Grey, seven, with ex-wife Davinia Taylor.
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