American socialite Nicole Richie landed in Sydney this morning all by herself.

The Daily Telegraph reported that the former party girl turned fashion designer and mother of two arrived just after 6am this morning.

The local paparazzi were very busy in taking photos of the star, who was surrounded by security guards.

Although she was happy to smile for the camera with a waiting fan, she stayed silent as she was whisked through the airport.

Richie hasn't lost her glamour yet with her stylish outfit: her trademark oversized glasses, jeans, a beanie and vibrant scarf that made her comfy look couture.

It was a let down that she wasn't joined by her long time partner Joel Madden from band Good Charlotte in her trip to Sydney.

It is believed that Madden was left in Los Angeles to take care of their two children, 2-year-old daughter Harlow and 9 month-old son Sparrow.

Richie is in the country for a short promotional tour and will officially open Pitt Street's MidCity.

She will be the face of the refurbished retail centre.