Whitney Houston wowed fans at a charity concert in London on Friday, that included a spectacular duet with her 15-year-old daughter Bobbi Kristina. The superstar headlined the Caudwell Children Legends Ball in the capital's Battersea Park, before a star-studded crowd including Destiny's Child's Kelly Rowland. Audience members tell People.com Houston "looked and sounded amazing" - and they were stunned when she brought Bobbi Kristina onstage to perform "My Love is Your Love" together. Just last week, an American tabloid claimed the teenager was hospitalized in February after attacking her mother and attempting suicide. The gig is the latest step in Houston's comeback - following a battle with drug addiction and a messy divorce from Bobby Brown. She is working on a new album with former mentor Clive Davis - and Rowland insists problems in the past shouldn't count against her, telling People.com before the London gig, "People should not judge her. She's done more than prove herself."