UNDER COVER: Usher turned up at the Marlies Dekkers show Sunday night, apparently trying to get an intimate knowledge of fashion. “You may have heard that I might be launching a lingerie line for men and woman,” he said, nothing that some of his designs were featured in his new “Trading Places” video. “Comfort and intimacy is very important.” Dekkers, a Dutch maker of racy innerwear, certainly decked out her front row with stars, including Kelly Rowland, who mused that lingerie “brings out our sexuality” and revealed that she sheltered one of Dekkers’ strappy little nothings under her dress. However, it was all a bit too much for Ne-Yo, who said that although he “dug” the show – which culminated with two women in black thongs dragging horse-body sculptures – he preferred seeing women in more toned-down styles. The R&B star and producer said he’s currently collaborating with Marilyn Manson and Usher on music, and starring in a film out next year called “Venice Beach.” “I have a place here,” said Mischa Barton, who chatted with her model friend Jessica Stam.