The final 13 contestants on ‘American Idol’ have been picked, and their first round as finalists next week is going to be a tough challenge. They will do a Whitney Houston Tribute. Well, at least the girls will. The final ladies will come together in the tribute, probably doing a medley of Whitney’s classic hits. Meanwhile, the boys will do a tribute to Stevie Wonder. Idol has been wanting to do a Whitney tribute for a while, but they were waiting until they got down to the finalists. Ryan Seacrest says they want to “acknowledge the impact that she had on popular singers, popular music and young singers that are trying to make it." Simon Cowell and L.A. Reid recently told reporters that they would consider doing a Whitney tribute on the next series of ‘X Factor’ but acknowledged that their rival talent shows would probably beat them to it.