The former Lizzie McGuire actress, 27, was pictured showing off her rapidly fading locks while heading to a dance class in LA yesterday.
Hilary shocked us all by dying her platinum blonde hair a vivid green colour last month but sadly for fans of her bright new 'do, it's not here to stay…
She told E! News: "I don't know how long I'll keep the hair. It's fun right now, it takes on different tones every time I wash it which is fun. Maybe two or three more weeks. It's not meant to be super permanent."
Hilary has been a busy bee lately juggling work on her new album with promoting new TV show Younger, which is currently airing on US TV.
It's a sitcom from the creator of Sex and the City about a 40-something woman who has a makeover and pretends to be in her twenties in order to land a job.
Meanwhile, her new single 'Sparks' has been climbing the iTunes chart.
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