She and husband Bader Shammas confirmed the news in a sweet Instagram post.
Lindsay said of the news: “We are very excited for our new family member to arrive and we are looking forward to this next chapter of our lives!”
The star has managed to keep her baby bump concealed from public view thanks to a series of clever hacks and is yet to give fans a glimpse at her expanding belly.
In true celebrity fashion, over the last few months, Lindsay has carefully chosen the best angles to pose for her selfies in, in order to not prematurely show any hint of baby bump.
The Mean Girls actress has only been uploading shots where she is cropped from the shoulders up in recent weeks in a bid to avoid showing off her stomach area.
In one stunning snap from New York Fashion Week, the star can be seen with a full face of make-up as she poses glamorously into the camera but is careful to angle the photo from her chest upwards.
Adding an extra layer of protection, Lindsay carefully allowed her hair to flow down her front in an effort to also keep her bump covered.
Whilst still sticking to the head and shoulder shots only, Lindsay appeared to be sure to not take any risks to unintentionally expose her baby bump through a clever choice of clothing.
In many of her recent snaps, Lindsay appeared to have opted to wear loose and baggy hooded zip-up jumpers.
In two shots from earlier in the year, she opted to wear both a black and yellow zip-up that seemed to sit loosely around her growing frame.
Similarly, she has also shared shots of her dressed in a number of dressing gowns in an extra bid to keep everything all covered up.
The child star and her hubby began dating just before the pandemic and shared the news of their engagement in November 2021.
In July, Lindsay quietly tied the knot with her boyfriend just one year after he popped the question.
The 36-year-old actress revealed the news in an Instagram post on Friday, July 1, 2022.
Alongside a photo of the pair, Lindsay wrote: “I am the luckiest woman in the world. You found me and knew that I wanted to find happiness and grace, all at the same time.
“I am stunned that you are my husband. My life and my everything. every woman should feel like this every day,” she said, referencing her love, Bader.
The Mean Girls star announced her engagement to the entrepreneur last November, debuting her stunning $200K diamond sparkler.