Double the Circus, Double the Fun?

(NEW YORK) Marc Jacobs' annual holiday parties are the stuff of legend, but this year's theme may need to be reconceived after this weekend's Diesel XXX party. Why? Both share the same theme of "Rock & Roll Circus." Diesel's Brooklyn gala on Saturday will feature performances by N.E.R.D. and MIA--if the rumors are indeed true, Britney Spears will make a cameo. That's a hard act to follow, even for Mr. Jacobs. His December 10 bash will happen somewhere in the environs of Rockefeller Center (sorry, crashers). Naturally, The Daily will be at both...