The singer-actress greets the crowd after dining in New York City. Plus: Madonna, Matthew McConaughey, LC & Lo and more


Also at Barbie's Malibu bash: Lauren Conrad and her Hills costar Lauren "Lo" Bosworth, who had nothing but praise for the Mattel icon. "I loved Barbie growing up," Bosworth told PEOPLE at the event. "And she is 50 and hot and fabulous."