Stars brought on the glitz in a variety of shimmery styles while hosting New Year's Eve bashes in New York and Los Angeles.

While Kourtney K. showed off her maternity curves in a plunging wrap dress, sis Kim got leggy in a white key-hole bodice.

Fergie looked like a walking disco ball in a metallic mosaic number, and Lady Gaga took the stage in a bodysuit with heavy embellishments throughout.

Photos (left to right): David Becker/Stringer/WireImage; Denise Truscello/WireImage; Steven Lawton/FilmMagic; Jemal Countess/Getty Images