Nicole Richie & Charlotte Ronson at last night's I Heart Ronson party.
Photo: JCPenney

No one throw’s a fashion party quite like Charlotte Ronson.  The designer invited her most fashionable friends (all of them?) to the Roosevelt Hotel in LA last night ot fete her exclusive summer collection for JCPenney. The I Heart Ronson line, which launched in Spring 2009, turns up the heat for warmer weather with affordable frilly dresses and rompers, tasseled maxi dresses, lightweight denim, lace shorts, and printed tops fit for the style-savvy summer set. Ronson, sporting a striped linen dress from the latest collection, says she looked to the English countryside and picnics for inspiration. “There’s lots of gingham, florals and eyelet dresses—what I feel you want to wear in the summertime.” She adds, “Our line is always dress heavy; it’s just an outfit all in one.” The designer credits I Heart Ronson’s continued success to a firm grasp of her customer base—not to mention hard work and some serious multitasking skills. Ronson recently wrapped her latest collaboration with UNIQLO, is currently working on a new swimwear line with Shoshanna, and is prepping her eponymous spring collection in between. Inside the hotel’s Spare Room, sister Samantha Ronson DJ’d while Ronson supporters Jordana Brewster, Alice Eve, Nicky and Paris Hilton, Nicole Richie, and Ashlee Simpson took advantage of the mini bowling alley. “I’m a big bowler; it’s fun!” boasted Nicky Hilton.  In between strikes they shopped “Charlotte’s Closet,” a merchandising fixture in JCPenney stores and “a window into the designer’s space.” I Heart Ronson retails for $18 to $72 and is sold exclusively through JCPenney.