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Since posting, Duff's blue hair reveal has gained the likes of more than 780,000 people with comments from celebrities such as Mancy Moore saying, \"You're the coolest, lady.\"

Capri also chimed in, saying, \"At least you didn't cut bangs OR GO BROWN (again!) love you so so so much and I'm happy to spend the whole day and do it all over again, like, if you happen to have girl!? do we go pink!??? love you to the moon backkkk!!!\"

Duff has been tight-lipped about the gender of her upcoming baby, but she is already a mother to a 2-year-old daughter, Banks Violet, and a 8-year-old son, Luca Cruz.

View this post on Instagram

A post shared by Hilary Duff (@hilaryduff)

This isn't the first time Duff stunned fans with blue hair. Last year, in April, she also popped up with the same vibrant hue.

While she generally sticks with blonde hair, it looks like blue might be a color she will continue to come back to.

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