Fear not, she hasn't covered Westlife! This is the first single from her new album. I think it's interesting to see how acts like Christina and Brandy, who were around pre-Rihanna and have been away a while, will fare with their new material now that female r'n'b acts are so prevalent in America and internationally. Will they adapt to the new sound or stay true to what they were known for? Will they be able to compete in a now very competitive area of music? Christina has released quite varied music in the past, and her voice and persona are flexible enough that she can change with the times, which I think she has managed to do here. Us Against The World is a ballad, and there's something very familiar about it (I'm wondering if I've heard it before, but can't think where or when), but what I'm pleased to hear is that it's not just another rehash of Irreplaceable. I love Irreplaceable, but it's great to hear something which fits current trends (should please Umbrella fans, and is reminiscent of Love In This Club and Apologise) while retaining some originality.