BRANCHING OUT: A diffusion line, who doesn’t have one these days? Kimberly Ovitz is the latest designer to enter into the lower-price-line realm with her eco-friendly foray, O by Kimberly Ovitz, which was feted Tuesday night at Curve on Mercer Street. Guests noshed on rock candy and sipped various Skinnygirl libations (rose, margarita and white were all being served) while viewing the collection of supersoft tees and dresses, all of which retail for less than $200. “I’m wearing it right now,” Ovitz said of her slouchy black frock. “It’s cozy, easy, accessible, approachable. I’m all about it.” O by Kimberly Ovitz is available for purchase at Kimberlyovitz.com.