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While there may have been some stunning jewelry on the 2012 Emmys red carpet, it was Kelly Osbourne’s 267-carat black diamond-adorned nails that really caught our attention! Bringing a whole new meaning to the phrase “dripping in diamonds,”  the E! Fashion Police host stepped out with a cool quarter-million dollar manicure from L.A.-based high-end jeweler Azature. “The black diamond is the ultimate fine jewel. Its combination of beauty, mystery, and sophistication makes it a timeless luxury,” Azature told InStyle.com. “One day I thought, why not showcase this style on nails? So I developed a black diamond-infused nail polish with the same attention and quality as my jewelry.” With the launch of the lacquer, the jeweler translates his love for the world’s finest gems into a beauty must-have. However, if the limited-edition $250,000 bottle is out of your price range, you can snap up a $25 version of the world’s most expensive nail polish (at azature.com) to achieve the black diamond digits.

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Project Accessory‘s first round of guest judges has been revealed! Debra Messing and Kelly Osbourne will critique accessories designers on the upcoming Lifetime competition show, joining judges Kenneth Cole, Molly Sims and InStyle‘s own Ariel Foxman. Another reason to set your DVRs: The guest judges for Project Runway All Stars have also been announced, with an eclectic lineup that includes Miranda Kerr, Pharrell Williams and Miss Piggy, CNN reports. Tell us: Will you be tuning in?

PLUS: Click through the gallery to find out what your favorite past-season PR contestants are up to now!

Kim Kardashian and Kelly Osbourne buddied up at a charity bash thrown by the St. Bernard Project in Los Angeles last night. Britney Spears headlined the event, which was organized to raise money for efforts to rebuild New Orleans—a cause close to the Louisiana native’s heart. Osbourne blasted some Britney in the car ride over to get herself pumped for the party. “Listening to @britneyspears in the car on the way there!!!!” Osbourne tweeted. Click “See the Photos” for more photos from last night’s hottest parties, including pics of Penelope Cruz, Zac Efron, Nicki Minaj, Jennifer Hudson and more.

Kelly Osbourne is the new face of Material Girl, the clothing line designed by Madonna and her daughter Lourdes “Lola” Leon. (Osbourne took over for Taylor Momsen, who modeled the line’s debut collection last fall.) The Fashion Police star’s new campaign recently launched, and we got our hands on some amazing behind-the-scenes images of Osbourne modeling, including this exclusive photo, shown right. Click through to see more photos of Osbourne shooting her new Material Girl campaign, with cameos by Madonna and Lola. The new spring collection of Material Girl is available at Macy’s stores and Macys.com now.