Beyonce Knowles showed off her toned figure in a glimmering silver outfit at her first concert post pregnancy. The multiplatinum singer, who gave birth to daughter Blue Ivy Carter in January this year, said: "Y'all don't know how hard I had to work," she told the crowd. "I had to lose 60 pounds (27 kilograms). They had me on the treadmill, eating lettuce." Coming Up: Blue Ivy Carter's first pictures.