The 44-year-old pop star announced her news to her fans via social media by posting a meme on Instagram calling herself "Mama Spice", next to a sketch of pregnant woman.
Later, her team made the announcement official with a proper statement.
"Spice Girl Geri Horner (Halliwell) and husband Christian Horner OBE, 42, are absolutely delighted to announce they are expecting their first child together," a representative for Geri said.
"The couple is overjoyed with the good news and cannot wait to welcome the newest addition to their family."
Horner, the Team Principal at Formula One outfit Red Bull Racing, married Geri in a ceremony in Bedfordshire last May, at which Bluebell was a bridesmaid.
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