Smith/Steffman/Splash News Online
08/12/2009 AT 03:00 PM EDT
, grabbing cocktails with five
girlfriends at Katsuya Brentwood. The singer enjoyed grapefruit cosmos and
some sushi during her night out. "[Her pals] seemed to be
trying to cheer her up and just have a good time," an onlooker tells us. The singer was "very sweet," the onlooker says, adding that she snapped pictures with fans.