Spears, 40, revealed she and fiance Sam Asghari, 28, are expecting their first baby together in an Instagram post.
The singer – famous for hits including Oops I Did It Again and Baby One More Time – described how she noticed changes in her stomach that at first she dismissed as weight gain.
“So I got a pregnancy test … and uhhhhh well … I am having a baby,” she wrote.
The pop star also recounted how she suffered depression during a previous pregnancy and how she now feels women can more openly discuss their mental health while pregnant.
“This time I will be doing yoga every day !!! Spreading lots of joy and love!!!” she posted.
In June 2021, Spears complained during a court hearing that she was being prevented from marrying or having more children.
In November, a judge ended the 13-year conservatorship arrangement that had allowed her father, Jamie Spears, to control her personal life and $US60 million ($A81 million) estate.
Spears has two sons, Sean Preston, 16, and 15-year-old Jayden James, from her previous marriage to Kevin Federline.
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