The former Spice Girl wed Formula 1 boss Christian Horner, 41, today at St. Mary's church in Woburn, Bedfordshire in the United Kingdom, The Daily Mail reported.
Halliwell, 42, wore a traditional, white, lace gown complete with a long veil.
Prior to the ceremony, the bride Instagrammed a sneak peak of her 'something old, new, borrowed, and blue.
All included vintage pearl earrings, a glimpse of her dress, a diamond necklace, and a blue bow, which she titled 'Bluebell,' as an ode to her daughter from a former relationship.
After saying, 'I do,' Haliwell shared a kiss with her new husband while family and friends snapped photos outside the doorway.
The couple's nuptials came following a six month engagement, which Halliwell announced via Twitter on November 11.