DRESSING LIKE J.LO: Many a fan would love to spend a day in Jennifer Lopez's shoes, let alone her dress or her jewelry. And starting tonight with a preview reception, it will be possible, since women will be able to buy the curvaceous star's costumes from "El Cantante," the biopic of salsa star Hector Lavoe that costars Lopez's husband, Marc Anthony. The vintage ensembles, which span the decades from the Sixties on, are on sale at East Village store Screaming Mimi's, with part of the proceeds benefiting amfAR. Included in the offering is Anthony's wardrobe and those of background actors, with prices starting at $55.

Lopez's hand-me-downs include an early Eighties velvet keyhole dress she wears in a nightclub scene, selling for $295; a pair of Seventies red-trimmed denim HotPants ($265); the teal polyester dress featured in the film's poster ($425), and a Lanvin cuff priced at $750. "Lots of times they wrap movies and the costumes go into storage," says store owner Laura Wills, noting that ironically a few of the items had been purchased from her store in the first place. "It was a great windfall to be able to buy the costumes from the movie. This is the crème de la crème of vintage."

But anyone who wants to wear Lopez's costumes will have to bear some resemblance to her: at size 4 to 6, "she's pretty small," says Wills.

WORKING THE MALL: American Eagle Outfitters threw a "denim carpet" premiere for its new TV ad series, "It's a Mall World," directed by Milo Ventimiglia of "Heroes," on Tuesday night at the Cinerama Dome in Hollywood, followed by a party at the Cabana Club attended by cast members and celebrities including Dixie Chick Natalie Maines, Rachael Leigh Cook and Ventimiglia's "Heroes" co-star Hayden Panettiere. The first of 12 three-and-a-half-minute episodes will premiere during a commercial break on MTV's "The Real World: Sydney" on Aug. 8. The minisitcom centers around five friends working at various mall shops. The company's Web site will feature longer, five-minute clips of each episode the day after it airs on MTV, plus an extra episode at the end of the season.