The singer — once known as Ginger Spice — marked the special occasion on Sunday by sharing a photo of herself admiring three different cakes decorated with lit candles.
Halliwell-Horner's former bandmates also commemorated her birthday. Victoria Beckham posted a throwback photo on her Instagram Story of her and Halliwell hugging in front of a plane.
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“Happy birthday @gerihalliwellhorner!! Love you!!! xx,” the 49-year-old fashion designer (formerly known as Posh Spice) wrote over the picture.
Emma Bunton posted a compilation video filled with memories captured of her and the birthday girl from over the years, including their time in the band and at Halliwell-Horner's 2015 wedding.
“Love you to bits ❤️ Happy Birthday my soul sister @gerihalliwellhorner 🎂🎈Hope you’re being spoilt and sending lots of hugs 💕💕,” wrote Bunton (aka Baby Spice), 47.
“Thank you 🙏 so beautiful,” Halliwell-Horner replied in the comments.
Melanie "Mel C" Chisholm also shared a few snapshots to honor Halliwell-Horner's birthday on her Instagram feed. She posted a hilarious throwback image of Halliwell-Horner jokingly choking Chisholm, along with another sweet snapshot of the pair.
