On Saturday Geri's new baby turned two weeks old, and to celebrate a fortnight of motherhood she shared the first picture of her new family to Instagram.
The former Spice Girl posted the sweet snap to the social media site, sharing it with her 344k following of family, friends and fans.
The adorable photo shows the new mum holding her baby, affectionately known as Monty, in what looks to be a nursery. Dressed in a cute, white baby grow which was patterned with little dots, baby Monty looks peaceful snuggled into his mum's arms.
Husband and father Christian also makes an appearance, shown with an arm around his wife whilst landing a kiss on his new son's head - so sweet!
Geri captioned the photo with a short message, telling followers that Monty was two weeks old that day. She wrote, 'Monty is two weeks old today 👶🏼x'.
Fans flooded the image with comments, congratulating Geri and Christian and commenting on how cute little Monty is.
One Instagram user wrote, 'Oh my goodness!!!! He's absolutely adorable!! This picture is so sweet, I love it. God bless you guys💙 Xx' whilst another one agreed, 'Oh gosh Geri❤ I'm just out of words.....Such a beautiful, beautiful picture and your little bundle of joy how gorgeous is Monty😍 i'm so happy for you and your family bless you🙏🏻❤'.
Geri, 44, announced the arrival of her son in a tweet on 21st January to her 409,000 followers, writing: 'Christian and I are delighted to announce our baby boy was born this morning weighing 7lbs 8oz 👶🏼👍🏻'
Christian and I are delighted to announce our baby boy was born this morning weighing 7lbs 8oz ð‘¶ð¼ð‘ð»— Geri Horner (@GeriHalliwell) January 21, 2017
She then took to Instagram to share a glimpse of the new arrival and announce his name: Montague George Hector, or Monty for short.
Geri is already mum to daughter Bluebell from her relationship with journalist and screenwriter Sacha Gervasi, whilst husband Christian has a daughter Olivia with his ex-partner Beverley Allen - but Monty is the first boy for the pair.
'Montague George Hector Horner arrived this morning, a beautiful little brother for Bluebell and Olivia #amazing-day #grateful #monty 👶🏼' Geri wrote alongside the snap of the newborn's feet.
The singer first announced that she was expecting back in October 2016, when she shared a picture of a doodle using lyrics from the song 'It's Raining Men', which she famously covered in 2001.
'God bless mother nature #mamaspice' the image read.
A spokesperson for the star later confirmed the happy news, saying: 'Spice Girl Geri Horner (née Halliwell), 44, and husband Christian Horner OBE, 42, are absolutely delighted to announce they are expecting their first child together. The couple is overjoyed with the good news and cannot wait to welcome the newest addition to their family.'
Speculation that the couple may have had fertility treatment was also addressed, with a source close to the family telling the Mirror: 'It's a 100% natural conception.'
'Geri didn't want to explicitly go into details, but she knew people would read between the lines when she mentioned Mother Nature.'
'She's a proud pregnant woman in her 40s and wants her fans to share the couple's joy.'