EXHIBITIONISTS: Fashion designers continue to flex their artistic muscles — and clout. Helmut Lang plans to open his first solo exhibition next month at Brooklyn’s trendy Journal Gallery. Lang’s installation is said to include a multifaceted mirrored object and photos of colorful ornaments against a backdrop of black-and-white porn. “The idea relates to the Janus mythology, representing time as one half respects the past and the other one looks into the future,” Lang told Neville Wakefield in a 20-page interview in the gallery’s journal.

And, on Wednesday night, Hedi Slimane lifted the curtain on his solo exhibition at the Almine Rech Gallery in Paris. Titled “Perfect Stranger,” the show includes photos of young rock fans, a source of inspiration for Slimane since his Dior Homme days.

HOMECOMING OF SORTS: After years of absence, Prada will again attend the Pitti Uomo men’s wear exhibition. But don’t expect to see the entire Prada men’s collection on the runway. In true Prada style, the fashion house will present only a new sneaker with its staple red band, designed in different materials, at Pitti Uomo, which runs Jan. 9 to 12.

TIME TO DIAL: Watch brands are the latest branch of luxury leaguers courting the cellular phone market. Tag Heuer, the LVMH-owned Swiss timepiece maker, has inked a license deal with ModeLabs Group, a Paris-based customized cell phone specialist, for the production and distribution of its first cell phone, to be released in the second quarter of next year.