Wow, time really does fly. We can’t quite believe it but David and Victoria Beckham are celebrating their not-so-little girl Harper’s 13th birthday.

The newly-turned teen is the youngest of the power couple’s four children, having been born on July 10, 2011.

Given that she’s totally doted on by not only her mum and dad but also by her three older brothers Brooklyn,

Romeo and Cruz, it’s gone rather unnoticed that Harper has turned into a little woman before everyone’s eyes.

Paying tribute to his baby girl, David shared a montage of photos and videos from the past 13 years.

Some of the precious moments captured include snuggles with her brothers, walking the runway with her mum after a fashion show, and making her dad proud by scoring a goal.

The former footballer wrote: ‘Happy 13th Birthday to my beautiful little girl. Daddy is so proud of you, you have grown up to be a kind, generous and a beautiful young lady with the most amazing heart and the most amazing smile that we all love so so much.’

‘Always be the beautiful person that you are,’ David added, before sweetly concluding: ‘Harper Seven you’re my world.’

Sharing the same montage, Victoria wrote: ‘Happy Birthday to my best friend. You are sweet and kind and your smile warms our hearts every day. You really are our everything Harper Seven and we are so proud of the happy, beautiful, talented young lady you are becoming. We love you so so much. Kisses.’

Victoria later shared a gas video of a much younger Harper having a boogie in the back car to September by Earth, Wind & Fire- we can’t blame her, what a banger!

Posh Spice wrote: ‘Yep… She gets it from her mummy!!! We love you Harper Seven!! Never stop smiling or DANCING!!! You are my world xxxxx Kisses mummy xxxxx.’

Romeo and Cruz, who take their big brother duties ever so seriously, have also paid tribute to their baby sister on her 13th birthday.

Cruz shared a sweet video and snap of himself and Harper from back in the day, wishing her a happy birthday and calling her a ‘special human’.

Meanwhile Romeo shared the sweetest snaps with his little sister, writing: ‘Happy 13th birthday Harps can’t believe you’re a teenager. Love you so much xx.’