Even in death, Whitney Houston was a winner at Sunday’s Billboard Music Awards. The superstar singer, who died suddenly in February was the posthumous recipient of the Millennium Award, with Whoopi Goldberg introducing two tribute performances: John Legend sang “The Greatest Love of All’’ and Jordin Sparks sang “I Will Always Love You.’’ Then it was Bobbi Kristina’s turn. The daughter of Houston and her ex-husband Bobby Brown thanked her mom’s many fans. “I just want to say thank you to everyone who’s supported us through it all. Not just from when it was good, but when it was bad, too,’’ she said. “Thank you so much for showing that much love, because she deserved it. She did. I’m just blessed to have been in such an incredible woman’s life. There will never be another one, never, and I thank you.’’ We’ll be seeing a lot more of Bobbi Kristina now that she and the rest of Whitney’s family have signed up to appear in a reality TV show on Lifetime.