Alexandra Daddario just checked into her newest chapter: motherhood.

The White Lotus actress shared she and husband Andrew Form have welcomed their first baby together, announcing the news Oct. 31 with a cheeky Halloween shoutout. 

In the photo, the baby is swaddled in a blanket and playfully adorned with pieces of Halloween candy. Alexandra, 38, captioned the post, "I thought this was a weird bowl of candy."

Her friends flooded the comments section with well wishes, including her White Lotus costar Sydney Sweeney, who wrote, "Congrats!!!!!!!!!!" And picking up on Alexandra’s Halloween joke, actress Michelle Monaghan added, "Best candy to nibble on!!" 

While their little one, whose name and sex they have yet to share, is Alexandra's first child, it's Andrew's third: He shares sons Rowan, 10, and Julian, 8, with ex-wife Jordana Brewster.

The Baywatch actress first announced that she was expecting back in July, saying that being pregnant "was actually quite hard to process."

"You have a lot of complicated feelings," she explained in an interview with Vogue revealing the news. "I’m finally embracing it. I can show it off."