off her growing baby bump for the first time last night in an Instagram video taken inside her home.

“So I have to model my clothes now before I really start showing,” she captioned the post. “I had to do the flower ? on my neck like @sarahjessicaparker.”

The “...Baby One More Time” singer modeled several outfits in her signature dancy pose, most of which showed off her still-toned but growing belly.

“I actually do have a small belly here but at least my pants ? fit ?????? … Well barely ???‍♀️ !!!” Spears wrote. “Psss is anyone curious why I'm 4 sizes smaller by the door ???? ???”

Spears also made a reference to her pregnancy with her song choice for the video: “All That She Wants” by Ace of Base. She flaunted her looks to the lyrics, “All that she wants is another baby / She's gone tomorrow, boy / All that she wants is another baby, yeah.”

The pop star's video came a day after she announced she's expecting her first child with fiancé Sam Asghari (she is also mom to sons Sean and Jayden Federline, whom she shares with ex Kevin Federline). In the Instagram reveal Monday, Spears admitted she initially thought she was just bloated from food, but a pregnancy test eventually confirmed she is, indeed, expecting.

“So I got a pregnancy test … and uhhhhh well … I am having a baby ??,” she wrote. “This time I will be doing yoga ?‍♀️ every day !!! Spreading lots of joy and love ? !!!”

Asghari also opened up about the happy news, sharing a post on Instagram yesterday.

“Marriage and kids are a natural part of a strong relationship filled with love and respect. Fatherhood is something I have always looked forward to and I don’t take lightly. It is the most important job I will ever do?,” he captioned a photo of an illustration of a lion and lioness with their cub—a sweet nod to Spears, whom he calls his “lioness.”