Nicole Richie has a new 'do!

The "Fashion Star" mentor shared a photo on Instagram Monday, showing off her freshly-dyed lavender locks.

"About last night ...," the House of Harlow designer wrote along with the pic, where she's styled her lilac tresses in a sleek bun.

Last week, Richie posted another photo of herself rocking a purple 'do, similar to Kelly Osbourne's signature shade -- but that shot was just a lil Photoshop magic.

This time, we think Nicole actually took the plunge!

Kelly Osbourne shared a candid snapshot with Nicole on Sunday, writing, "Guess took the bet & dyed there hair MY color @nicolerichie [sic]."

What do you think of Nicole's new purple 'do? Sound off below!

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