Derek Zoolander, aka Ben Stiller, has catwalked over the Sydney Harbour Bridge.

In Australia to promote his new movie Zoolander 2, Stiller channelled his model alter-ego, striking his signature blue steel look, while accessorising the daggy but necessary bridge climb jumpsuit.

Draped in a Union Jack scarf and sporting some fashionable sunnies, the model braved the heights and winds of the bridge and strutted along the scaffolding.

A short video of the feat, posted on YouTube, was shot with the Opera House in the background, creating quite a scenic catwalk for the "so hot right now" model.

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Sadly rival and now partner in crime, Hansel wasn't there to challenge Derek to a "Walk Off".

Zoolander 2 opens in New Zealand cinemas on February 11.

- AAP