Actress joining panel on hit US show

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Jessica Alba is to be a guest judge on Project Runway.

The actress, 28, will help oversee a challenge where the contestants have to design an outfit for an ‘opinionated celebrity’. 

Jessica will be seen on the panel in an episode to air in the States on Thursday. 

Nicole Richie, 28, has already served as a guest judge this season. 

Heidi Klum hosts Project Runway.