Kate Middleton's first appearance after delivering her son, Prince George, was surely outside the Lindo Wing of St Mary's Hospital with royal baby cradled in her arms and Prince William by her side, but the Duchess of Cambridge will soon make her first official public appearance since becoming a mother.

Kate Middleton, along with Prince William, will be at her first royal job in September, since Prince George's birth on 22 July. The royal couple will be guests of honour at a charity event by Tusk Trust, Daily Mail reports.

Trust Tusk is a charity organisation that funds African conservation projects, of which William is patron. The Duke and Duchess of Cambridge will attend the the organisation's conservation award ceremony. Interestingly, the awards feature a lifetime achievement award named after Prince William to recognise the outstanding work of a top conservationist in Africa each year.

Charity works apart, Kate Middleton's first official public appearance post-delivery is expected to keep fashion watchers on toes.

Even for the royal tradition of showing new-borns outside hospital, Kate's sober and simple style caught rapt attention. For the occasion, the Duchess wore a bespoke polka dot dress from Jenny Packhamc. The knee-long, baby-blue coloured dress, which Kate paired with cream wedges, made her post-baby bump obvious. And Kate seemed as confident in carrying herself as ever.

Kate Middleton and Prince William are reportedly staying with Prince George at Kate's parents' mansion in Berkshire. Before making her public appearance in September, Kate will probably move to her new house Anmer Hall in Norfolk, which was gifted by the Queen to William and Kate early this year, as she wants to spend some quality and quiet time alone with her newborn.