A new pair of happy feet are waddling around a Sydney penguin enclosure, after a beloved same-sex penguin couple welcomed their foster chick into the world at Sea Life Sydney Aquarium.

The same-sex Gentoo penguin couple, Sphen and Magic, attracted worldwide fame after they paired up before breeding season, performing the species' tradition of collecting and giving each other special pebbles for their nest.

Sydney's beloved same-sex penguin couple has welcomed a fostered chick.

After being given a "dummy egg" by aquarium staff to test their parenting skills, they were given an egg from another penguin couple at the aquarium who had laid two eggs.