Guess which uber Aussie model has given birth?

GO behind the scenes with Australian model Kirsty Hinze as she does a photoshoot for The <i>Sunday Magazine</i>.

RENOWNED Aussie model and philanthropist Kristy Hinze-Clark has given birth to her second child, another girl, that she and computer guru husband Jim have named Harper.

Kristy happily announced the new addition, telling close friends before sharing her news via her social media platforms.

Welcome to the world, baby Harper x Source: Supplied

Harper joins 3-year-old "big sis"' Dylan in the Clark family fold.

''#becauseimhappy #myangels Welcome Harper!'' Hinze-Clark said in her Facebook post with a picture of the 3 Clark chicks.

Kristy also posted a note on Twitter:

''Elated to announce the birth of our 2nd daughter Harper. August 19, 2014 we are happy and healthy and completely in love''.

Kristy and her Texan born husband were in New York for the birth and were joined by Kristy's parents, Vivienne and Rod, who flew in just in time for the new arrival.

Over the last few years Hinze-Clark, 34, has also become quite the ecowarrior, taking up many issues, all with an environmental cause.

Clark, a computer scientist and Silicon Valley notable founded Netscape, is described as one of the founding fathers of 3-dimensional computer images.

Jim Clark and Kristy Hinze arrive for an exclusive Bon Jovi concert at Star City on December 15, 2010 in Sydney, Australia. Source: Getty Images

The Clark family live in Florida and are also huge yachting enthusiasts with Jim's latest, 100 foot, state-of-the-art boat hoping to be here for this years Rolex Sydney to Hobart race which starts on Boxing Day.

Kristy and Jim married in 2009 on the British Virgin Island named Virgin Gordo in a four-day celebration which included guests having a pre-wedding party on Richard Branson's Necker Island.

Kristy Hinze with billionaire husband Jim Clark during their wedding ceremony on the beach at the Little Dix Day Resort in the Caribbean. Source: News Limited

Guests like Naomi Watts, Ed Norton and director Bennett Miller joined the celebrations Hinze has never let celebrity, fortune or fame go to head, always sticking by the friends and the family she adores.

Many of those same friends and family travelled to the Dominican Republic in March to celebrate Clark's 70th birthday, with a mega 4-day celebration.