ActressKatie Holmes, who poses discreetly topless in the August issue of Glamour, tells the magazine she remains focused on being a mother to Suri Cruise, her 8-year-old daughter with ex-husband Tom Cruise, 52. "Motherhood is the greatest gift," Holmes, 35, said. "When I became a mother, my life completely changed. . . . I didn't know how much love I had in me. It's overwhelming. Every day I discover more about this spectacular human being I get to be the mother of." As for dating, however, she says "I am really focused on motherhood and work right now."