02/08/2011 at 02:00 PM EST
took a break from rehearsing for her Oscar night co-hosting duties
for some afternoon shopping on Melrose Avenue in L.A. with a female friend. The ladies made a lengthy stop at Crystalarium in West Hollywood, where she ended up buying two crystals. "She looked radiant," an onlooker tells us. "She and her friend were just chatting and pointing things out to each other as they walked around the store."