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Star Halloween Costumes of 2011

From Fergie's pageant queen to Jennifer Garner's witchy woman, see Hollywood's wild and wacky getups

ALYSON HANNIGAN

No stranger to celebrating the holiday, the How I Met Your Mother star adds a sweet touch to her scarecrow costume while trick-or-treating with her little pumpkin, 2-year-old daughter Satyana, in Santa Monica, Calif.