Dominique Faget, AFP / Getty Images | Alfredo Estrella, AFP / Getty Images | Steve Granitz, WireImage

Kelly Osbourne's
transformation to style swan is all but complete.

The 26-year-old British beauty has been named the new face of Madonna's Material Girl fashion line.

Osbourne, who once called herself an "ugly duckling," replaces "Gossip Girl" star Taylor Momsen, according to a tweet from the company.

Material Girl is a year-old juniors design collaboration between the iconic music superstar and 14-year-old daughter Lourdes. It's sold exclusively at Macy's.

"Material Girl is thrilled to confirm that Kelly Osbourne is the new face for 2011. We will be sharing all the details on this exciting new campaign in the coming weeks," her rep confirmed in a statement.

Material Girl launched in 2010 with rebellious Momsen as its face. Late last year though, Lourdes blogged that the label was "desperately seeking" a new face.

Osbourne, who slimmed down considerably after an image-altering turn on ABC's "Dancing With the Stars," has updated her look from goth to glam.

"I've spent the last few years trying to figure out who Kelly Osbourne is, from addiction to awards and fashion faux pas," she writes on her official blog.

Turns out the E! "Fashion Police" co-host is part of a mutual admiration society with Madonna's clan.

"Kelly's always been a huge fan of Madonna and recently heard Lourdes idolized her, which she was very flattered by. It's a huge coup," reports Britain's Sunday Mirror.

Speaking of "Gossip Girl" stars fronting fashion labels, read about what Momsen's co-stars Blake Lively and Leighton Meester have been up to lately.

And for more on celebs slimming down, check out the biggest weight-loss winners of 2010.