Geri Horner has welcomed her first child with husband Christian Horner.
The Spice Girls star announced the name of her newborn on Instagram: Montague George Hector Horner.
"Montague George Hector Horner arrived this morning," Horner, 44, wrote, alongside a black and white photo of her son.
"A beautiful little brother for Bluebell and Olivia".
Earlier on, Horner announced the arrival of her little one on Twitter.
The singer is mother to Bluebell, 10, from a past relationship.
The Spice Girl married Horner, a Red Bull Formula 1 principle, in May 2015.