Pop star Christina Aguilera was shocked during a recent hotel stay, when fellow guest Jessica Simpson slipped a fan letter under her door. The 25-year-old was touched by Simpson's words and insists women in the music industry need to be supportive of one another. She explains, "Recently, I was staying at a hotel when I got a letter from Jessica Simpson, who was in the penthouse across the hall. It was super complimentary. "She said my voice and my artistry were pushing her. I was touched, because that's so rare in this business, which stirs competitive nature and cattiness in women. "Hats off to Jessica - that was a cool move. It's a beautiful quality to be a woman in support of other women. The world needs more of that."