Mel B threw a Barbie and Ken themed birthday party for her daughter Madison

The youngster was surprised to be welcomed by a life size model of the popular dolls, a Barbie-inspired rainbow cake, which boasted a number of tiers and was decorated with blue icing, sprinkles and a Barbie figurine on the side, as well as a pony dressed to resemble a unicorn.

The Spice Girls band member - who also has daughters Phoenix, 18, and Angel, 10 - posted a string of photographs from the special day on her Instagram account, which saw her gush about her "shining star" and the "amazing birthday party" she arranged.

Mel wrote: "Happy birthday my sweet baby girl,you are my world my shinning star my everything,I just cannot believe today your 6 AND your starting big girls school sooo much in one day wowza

"Omg what an amazing birthday party,ahhhh Madi I still can't believe your a big girl 6 years old #kenbarbiebirthdayparty #familyfirst #singleparentlife

"Ahhhhh madi bears my love!! Thank you @gary_90210 for the amazing Barbie rainbow cake it was soooooo good #kenbarbiebirthdayparty #familyfirst #singleparentworkinghard (sic)."

The 'Wannabe' hitmaker - who was known as Scary Spice in the girl band - even dyed her hair a variety of shades to ensure even her locks co-ordinated with the unicorn theme.

Meanwhile, the 'America's Got Talent' judge shared a collage of four images from their recent family trip to Disneyland, and has admitted despite being involved in a length divorce battle with her estranged husband, Stephen Belafonte, Mel still finds happiness in spending time with her brood.

The final image, which also captured Stephen's daughter Giselle, read: "Awwww the happiest place on earth with my 4 girls yippee #Disneyland #girlpower #phoenix #gisele #angel #madison #singleparentworkinghard (sic)."