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OTRC: Jessica Alba guest stars on 'Cupcake Wars' (Video)

Jessica Alba appears on a Sept. 7, 2013 episode of the Food Network show 'Cupcake Wars.' (Food Network / Scripps Networks)

"Sin City" star Jessica Alba sinks her teeth into her sweetest role yet this weekend -- she is a special celebrity guest on the season 9 premiere of the Food Network competition show "Cupcake Wars."

The 32-year-old actress and mother of two serves as a guest judge on the episode, which airs on Saturday, Sept. 7 at 8 p.m. ET.

The contestants compete to try to bake the best all-natural, organic cupcakes for her and the other judges. The winner gets $10,000 and the chance to cater a launch party for Alba's new family brand, The Honest Company, which offers eco-friendly baby, bath, health and wellness products.

"As a guest judge and foodie, I was blown away by the contestants' culinary creativity in baking cupcakes that were made with healthier ingredients but still tasted and looked amazing," Alba says in a statement posted on the official blog of "Cupcake Wars."

Watch a preview and a clip from the episode, obtained exclusively by OTRC.com, above.

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