The diffusion line, which has already been worn by SJP -- who was brought on to work with the iconic brand last fall -- as well as Chloe Sevigny, starts at $195 for a metallic evening clutch and climbs to $895 for a floor-length gown.
Like the main Halston collection, the Heritage designs are inspired by the fashion house's archives and the Studio 54 crowd of the late '70s and early '80s, with a modern twist.
This translates to stretch jersey halterneck jumpsuits, heavily draped one-shoulder stretch-jersey caftans, double-layer silk maxi dresses, sequined vests and very disco-worthy little frocks.
The palette goes from black and white to vibrant shades of violet, orange, fuchsia and green, with a smattering of prints.
While the line -- which includes slouchy totes and other bags -- is now available on Net-A-Porter, fans will also be able to see many of the styles worn to perfection in the "Sex and the City 2" movie, out May 28.
In the highly anticipated flick, SJP wears a Halston Heritage drop-waist spaghetti-strap number, an identical version in an ankle-skimming length (for a beach scene) and a sexy white deep-V frock, which is worn on the promotional posters of the movie.
Plus, check out this celebrity-designed label at Net-A-Porter.