NBC’s Heroes returns for its third season on Sept. 22. One of the show’s stars is also an up-and-coming fashionista. Hayden Panettiere, who portrays cheerleader Claire, steps up to the hero role in real life with PanettiereCloset.com in which the actress sells off clothes straight from her closet, with proceeds going to her Save the Whales Again campaign. As Hayden says, “Cleaning out my closet is just the beginning; and putting my stuff up for sale is the first step in a crusade that will go a long way to helping these majestic mammals.”

In fact, Hayden just closed a moving sale, featuring furnishings from her family’s home. Every now and then, PanettiereCloset features an auction, most recently the Summer Breeze dress Hayden wore in her summer Candie’s photo shoot (it went for a cool $2,020).

But you don’t have to wait for special events to nab something of Hayden’s. Click on “The Closet” to see what the actress is parting with.

When we visited, you could select from the following items actually worn by Hayden:

• * Pink XE-LA Cheer to You soft T ($95)
• * This ultra-cute unique Hale Bob Winter Wonderland twisted silk top ($175; above right)
• * Tie-dyed unique MYNE Mirage scarlet silk dress ($290; left)
• * An Etnies Aaron Kraten Skater Girl hoodie ($95)
• * These Westholme Los Angeles pink comfort shorts ($75) — emphasis on short!
• * J & Company Beverly stone-washed deep blue capris ($179)

And there’s even a selection of pre-worn bikinis, including:

• a Brette Sandler Brownwyn bikini in blue and white ($199)
• this Le Doux Sexy Brazilian Very Berry bikini ($135; right)
• the Beach Bunny Cherry Pie bikini ($149)

Of course, unless you’re a size XS, 0-2 or just plain teeny, you won’t actually be able to wear any of these cool duds. Instead, you can snag a bag of Hayden’s, like the Rebecca Minkoff Morning After Mini Handbag in trendy red ($595; left) or the Rebecca Minkoff Plan B hobo ($675).

Or you could settle for an autographed black Whaleman cap ($45) or a personalized autographed photo ($50).

So take a peek in Hayden’s closet, and know that your purchase goes to a whale of a cause!