Condé Nast Media Group’s event — now in its fifth year — kicked off New York’s Fashion Week, which runs through September 12, 2008.  The rock concert/fashion show was hosted by Denis Leary (whose rotating designer outfits included one evening gown) and boasted a line-up of musical performances by Beyoncé, Justin Timberlake, Mariah Carey, Fergie, Black Eyed Peas, Chris Brown, Rihanna, Pussycat Dolls, Debbie Harry, Keith Urban, Kid Rock, Lynyrd Skynyrd, Chris Cornell, Solange and Duffy.

Proceeds from the concert benefited Stand Up To Cancer, an organization that distributes grants for collaborative cancer research.

Here’s Rihanna, kicking things off with Madonna’s fashion anthem, “Vogue“:

Beyoncé channeled Etta James (also in attendance tonight — first row) in her performance of “At Last” — a preview of her role in the upcoming film, Cadillac Records.

During the concert, the three major television networks aired an hour-long, commercial-free fundraising telethon for Stand Up To Cancer.  ($100M was raised that night.)  At 8PM, the cameras broadcast live from Fashion Rocks where 13 women singers performed the charity single, “Just Stand Up“.

From left to right: Keyshia Cole, Fergie, Leona Lewis, Ciara, Carrie Underwood, Mariah Carey, Mary J Blige,  Beyoncé, Miley Cyrus, Rihanna, Ashanti, Natasha Bedingfield and Nicole Scherzinger.

British singer-songwriter, Duffy and her dancers, performing her hit “Mercy“:

Black Eyed Peas, who covered The Rolling Stones’ “Miss You“:

Presenters Tommy Hilfiger and Gossip Girl’s Leighton Meester, whose seat was directly behind mine.

More photos to come… as always, you can check out the full set on Flickr.  For more on the musical performances, tune in on Tuesday, September 9 at 9PM ET when CBS will be broadcasting the concert.