Prior to the \"A Simple Favor\" actor's big reveal, Lo shared a slideshow of her anxiously awaiting her little one's arrival -- revealing that she and Golding actually welcomed their newborn last month.

\"On March 31st our lives changed forever,\" the fitness instructor revealed in the caption. Lo also explained to fans that she will be on \"maternity leave,\" so her social media posts have been put on hiatus.

She promised that she won't be away for long, adding, \"I’ll prob be up during midnight breastfeeds checking in on you, but otherwise 'I’ll be back' xx.\"

View this post on Instagram

A post shared by Mama + Wife + Instructor (@livlogolding)

Of the photos she shared to Instagram, the first two are of her preparing to go into labor while the third, a black-and-white photo, is her about to deliver her little one.

The final photo depicts the sleeping infant grasping both Golding and Lo's fingers.

The proud parents tied the knot on Aug. 20, 2016. While the two welcomed their first child, neither have revealed the name or gender of their newest and littlest family member.

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