As if we needed yet another excuse to shop, eBay just launched its Fashion iPhone app, giving shoppers one more reason to spend, spend, spend.

The online auction house's app is free on iTunes and is integrated with PayPal, so you can browse through millions of listings to buy new, designer, and vintage clothes, shoes, and accessories wherever you are, whenever you want.

And it's all super easy: Just tap the "eBay Fashion" icon on your phone to start flipping through categories including women, men, baby, kids, vintage, and ethnic. Search by keyword or refine your search to shop by size, price, color, or sub-category. Check out the demo.

"With eBay's Fashion app, we've created a unique shopping experience that consumers cannot get in front of a desktop computer, or even in a brick-and-mortar store," says Steve Yankovich, vice president of mobile platform for eBay.

"Shoppers can browse the millions of clothing items on eBay's 'racks,' build outfits to share with friends, and even virtually 'try on' clothing without ever stepping inside a dressing room."

Here are some the features he's talking about:

• Virtual Style Gallery: Check out the fashion trends in a slide show. See something you like? Tap it to see similar items for sale on the site
• Personalized Closet: Save your favorite items so they're easy to come back to later.
• Outfit Builder: Take the items you've saved in your closet, mix and match 'em, and virtually try them on with a saved photo or live image (just set your iPhone on camera mode and point toward a friend or a mirror to "try on" items). Not sure if you like your outfit? Save your image and e-mail it to your most fashionable friend for approval.
• Social Media Sharing: Send your top looks to Facebook, Twitter, and email.

The launch of eBay's Fashion app is just the latest addition to the site's fashion category. In April, we saw the debut of fashion.ebay.com. So, go ahead and shop -- just try not to spend $77,999 for an Hermès bag.