Wearing a festive and almost comical red "nose" in honor of Red Nose Day, the annual SIDS and Kids fund-raising event in Sydney, the Carnival Spirit sailed into port as part of a publicity drive that hopefully will help an untold number of young children, from the unborn to late childhood.

Red noses are usually reserved for clowns at kid's parties, but an enormous red nose has sailed into Sydney Harbour onboard a cruise ship.

The nose, seven metres in diameter, was worn by Carnival Spirit as she made her way to the Overseas Passenger Terminal on Friday morning.

It's reported to be the largest-ever red nose on a cruise ship and made a pretty picture on the dark and misty harbour.

Illuminated from within, the giant red "ball" was worn in support of Red Nose Day.

The annual SIDS and Kids fundraising event is in its 26th year and urges Australians to "get silly for a serious cause".

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