03/10/2010 at 06:00 AM EST
, scouting out jewelry from Nicole Richie
's House of Harlow line
during a visit to Kitson at the Americana mall in Glendale, Calif. The pop star, who was with her mom Lynne and a male friend, spent 15 minutes in the shop, where she also tried on some booties from the Olsen twins' Elizabeth and James line.