Count American Idol winner Jordin Sparks among the starlets who've recently undergone major weight loss. The 21-year-old Tweeted a picture of herself in a multicolored bikini, saying, "I don't know why but my bathing suit reminds me of fruity pebbles. :)" Doesn't look like Sparks has been eating any sugary cereal lately because sources say she's lost 30 pounds since last summer. Pre-weight loss, the "Battlefield" singer looked great, but she says that Oscar winner Halle Berry inspired her. "She is perfect! I think she is beautiful. For me being 21, and then seeing Halle Berry look as good as she does, I think I'm going to look as good as that when I am that age," Sparks told Us Weekly. So she took the initiative and "something just clicked with me, and instead of sitting around talking about it I said, 'I'm going to go hike that mountain!'" Sparks said. Former Cheetah Girl Raven-Symone flaunted a 35-pound weight loss recently, and fellow American Idol alumna Jennifer Hudson lost a stunning and well-documented 80 pounds on Weight Watchers.

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