08/12/2009 AT 3:00 PM ET
Janet Jackson, 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.