The 15-year-old took a supernatural role on Wizards of Waverly Place.
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Gomez clipped blond streaks into her chestnut hair for a playful (but not permanent) new look.
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Selena channeled Cleopatra with winged liner and tapered lashes.
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She got edgy with extra-long blunt bangs.
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For the UNICEF ball, she complemented her wavy faux-bob with bubblegum pink gloss.
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Fine highlights added depth to her smooth bob.
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The Ramona and Beezus star rocked a trendy side braid at the Nickelodeon Kids' Choice Awards. "A feathery look keeps it edgy," hairstylist John Dahlstrom said of the slightly undone plait.
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Bieber's girl wore her long locks in a romantic half-updo for the MTV Movie Awards.
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"Change is good," Tweeted Gomez about her colorful new streaks. Stylists Nikki Lee and Riawna Capri of the Nine Zero One salon in West Hollywood gave Gomez her pops of color, which are actually Great Lengths 3-D Hair Extensions in sapphire and amethyst.
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"It really is one of the best looks for the upcoming festive season," said Gomez's hairstylist Sascha Breuer, who created her bouncy look for the UNICEF Snowflake Ball. "It combines gorgeous flowing hair and long-lasting volume that is easy to achieve."
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The singer sported an intricate braided updo at the MTV Movie Awards.
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The star went straight and sleek for the Radio Disney Music Awards in L.A.