Former Lizzie McGuire star Hillary Duff was recently spotted with greenish-blue hair for the past few weeks. The 28 year old star reveals that true reason behind the major color change, according to USA Today.

"I've never done anything like this and I was just in Cabo with my son and I was staring in the ocean and I was like I want that on my head. So this happened," said the 28 year old actress told Ellen Degeneres in an interview.

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Duff's 3 year old son Luca has a different opinion about his mother's new hairstyle.

"Luca is very particular about how he likes my hair. There's absolutely no buns on my head, no ponytails. I'll have a ponytail and he's like, 'Um hair down mom, hair down please.' And I'm like, at least he knows what he likes," said Duff.

Duff's new hair allows the mother and son tandem to play a random game of Do you Know Your Colors?

"Now he likes to go through a roster of colors that he knows. He's like, 'Your hair's purple', and I'm like 'No, it's green.' And he's like, 'Nah' I'm like, 'Yeah' He's like, 'It's blue' 'No' 'It's purple'," said Duff.

Duff also revealed to Ellen Degeneres about the surprising amount of tattoos on her body. One of the tattoos she showed was an image of the comedienne's face with a huge number 12 beside it.

"It's my biggest one. It's a big commitment. Prime real estate," quipped Duff.

Duff will star in the upcoming TV Comedy, Younger, according to Daily Mail.

Her blue created such a stir that even her co-star Nico Tortorella, dyed his hair with same shade as Duff.

The co-stars were photographed together, sharing  a joke as they signed their names on the AOL Build White Board.

TagsHillary Duff, greenish blue hair