Hart spoke to StyleList at the joint birthday of actress Rosario Dawson and Yellow Fever designer Jamison Ernest at the Kastel lounge in the new Trump SoHo building in New York City. "These are the best thing ever, seriously," Hart said. "I love them!"
Footzyrolls -- seen on the feet of celebs like Audrina Patridge, Blake Lively, Kim Kardashian, Lake Bell, and Mariska Hargitay -- come in bold colors and even include a cloth bag for you to stash your heels in while you're wearing them.
The flats are especially popular for fashion professionals who need to travel between meetings but don't like the damage a city sidewalk does to their feet when they're in a pair of Jimmy Choos.
Described on the company's Web site as "your new best friend (minus the annoying Facebook status updates)," Footzyrolls sell for $25 - $30 and are available online.
Meanwhile, read why UGG knockoffs are bad for your feet.