You may have been a little busy with your Halloween costume this weekend to notice some celeb hair happenings going down. That’s why we feel it’s our duty to help you catch up, so you know, you’ll be ready for a potential “Star Hair Changes” category on Jeopardy one day. (It could happen!)

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Cara Delevingne debuted a brunette hue at the LACMA gala in L.A. and the warmer shade definitely plays up her eyes. Granted, the supermodel could probably pull of any color (or cut, or completely bald head), but we think her new brown tresses have more of a sophisticated vibe. (We wonder if her bestie Kendall Jenner influenced her at all?)

Jason Merritt/Getty; AKM-GSI

Zac Efron had a busy weekend hanging out with his new (rumored) girlfriend Sami Miró, but we’re more interested in that delicate goatee he’s sporting. It also looks like he got a trim up top, maybe for a new role … or maybe to impress his new lady friend?

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Lastly, Kylie Jenner went gray for Halloween and put in some fresh extensions (from her new line, no doubt). Apparently, the 17-year-old star liked her color change so much, she’s keeping it — for now. “A little grey never hurt nobody,” she captioned the above photo on Instagram. But don’t get too attached, because the hair chameleon is bound to change things up again very soon.

What do you think of the weekend hair happenings? Are you a fan of any of the looks? Share your thoughts below.

–Brittany Talarico