Meghan Markle shares never-before-seen photo of baby Archie to celebrate Prince Harry's birthday

Meghan Markle has shared a sweet birthday tribute to her husband Prince Harry with a never-before-seen-photo of their baby boy.

The Duchess of Sussex - who shares four-month-old son Archie with the royal - has paid tribute to her husband and his work with charitable causes as well as being the "best" husband and the "most amazing" father to their son.

Alongside a collage of her husband - which featured a brand new photo of from Archie's christening - she wrote on Instagram: "Your service to the causes you care so deeply for inspires me every day. You are the best husband and most amazing dad to our son. We love you. Happiest birthday! (sic)"

Meanwhile, Prince Harry - who celebrated his 35th birthday on Sunday - says his son Archie is already "getting so big".

The Duke of Sussex has given fans an insight into the young royal's progress during a visit to Lealands High School in Luton, England, revealing he's doing "really well".

In a video clip captured by a fan account, the British royal is seen telling a young girl: "He is really well, thanks. He is getting so big."

- Bang! Showbiz