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Far from her show's namesake, Selena Gomez attends her "Wizards of Waverly Place" fashion show in London Apr. 7. She looks more like a princess here than a witch!

Selena Gomez is celebrating a 60th birthday - not hers, but Trick-or-Treat for UNICEF's.

The 18-year-old Disney star is an ambassador for the humanitarian organization, and she performed a private acoustic concert Tuesday in West Hollywood to benefit the Trick-or-Treat for UNICEF program, which turns 60 this year.

Video: Selena Gomez performs "A Year Without Rain"

Dozens of young fans in homemade T-shirts waited for hours for a chance to meet the actress and singer before the show at the Roxy Theatre, on the famed Sunset Strip. The concert featured Gomez and her band, The Scene, performing acoustic interpretations of songs from their two albums.

Gomez is urging her fans to carry UNICEF's little orange collection box while they trick-or-treat this Halloween. She wants them to collect funds to help provide health care, clean water, food and education for children around the world.

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