Geri Horner has sent a gushing birthday message to her husband Christian Horner

Geri - who first found fame as part of the Spice Girls - said on Instagram: "You are my best friend. I love you more than words can say and I'm so grateful that you're in my life. I think you're an amazing person, you're kind, you're loving, you're generous.

"I'm just really really grateful and I just want to wish you the best, this new chapter in your life, just brilliance. You're an amazing man and I just want to wish you happy, happy birthday. I love you."

Geri celebrated her 51st birthday on August 6, and the singer received plenty of well wishes from her Spice Girls bandmates.

Alongside a throwback photo, Victoria Beckham wrote on Instagram at the time: "Happy birthday @gerihalliwellhorner!! Love you!!! xx (sic)"

Emma Bunton - who was previously known as Baby Spice - wrote online: "Love you to bits [heart emoji] Happy Birthday my soul sister @gerihalliwellhorner [cake and balloon emojis] Hope you're being spoilt and sending lots of hugs [heart emojis] (sic)"

Meanwhile, Melanie C also sent her best wishes to her Spice Girls bandmate, noting that they've already "made so many wonderful memories together".

The 49-year-old pop star said: "Happy Birthday @gerihalliwellhorner! Wow, these birthdays come round fast! We've made so many wonderful memories together, I'm hoping we can make more before too long. Have a fantastic day, love you to bits Ginge [heart and Union Jack emoji] (sic)"