Last night the Idol contestants got to train with Gwen Stefani and No Doubt bassist Tony Kanal. The singers stepped up to the challenge. Jessica Sanchez sang Whitney's “How Will I Know,” and it was pretty much perfect. Skylar Laine gave her best performance yet. Gwen said Skylar has voice like “ice cream.” Gwen noticed contestant DeAndre looks nervous when he performs, so she gave him a little pep talk.