Sarah Murdoch shines in figure-hugging black dress to join husband Lachlan Murdoch at black tie soiree

It was an important night for media mogul Lachlan Murdoch as he delivered the annual Sir Keith Murdoch Oration at the State Library of Victoria on Thursday night.

But it was his wife, model and presenter Sarah that drew the most attention, at least as the couple arrived at the black tie soiree.

The mother of three stood out in a floor-length black dress that glittered as she walked beside her husband of fifteen years.

The dress featured a tie around the neck and was an asymmetric style, with one side featuring a cap sleeve while the other side left her shoulder bare.

The 42-year-old, who is the ambassador for many charities, carried a small silver clutch in her hand.

The blonde, who keeps her hair short and chic, couldn't have looked prouder to accompany her husband to the evening, which is an annual event to honour the memory of his grandfather, Sir Keith Murdoch.

Inside the event at the State Library, which was also attended by fellow media mogul James Packer, Lachlan delivered the oration, using the opportunity to state the urgency of maintaining press freedom, the SMH reported.

After the formalities Lachlan and James were seen in conversation, the casino mogul as always a larger-than-life presence.

He clutched a glass of wine throughout the evening and pulled animated facial expression as he mingled with fellow guests at the elegant soiree.

Lachlan is the son of News Corp CEO Rupert Murdoch, who in turn is the son of Keith, an Austalian journalist who founded the media organisation.