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While we look forward to seeing celebrities' elaborate Halloween costumes every year, we're even more excited about their kids' cute getups.

And this year didn't disappoint!

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Neil Patrick Harris and David Burtka's 5-year-old twins, Harper and Gideon, are always among the most festive this time of year. This Halloween, the family channeled classic Hollywood, with the kids paying tribute to Marilyn Monroe and James Dean.

Kourtney Kardashian and her little ones, meanwhile, honored the '90s: Mason, 6, Penelope, 4, Reign, 1, and mom all dressed as the Mighty Morphin Power Rangers.

RELATED: Chrissy Teigen shares adorable photo of baby Luna dressed as ... a hot dog!

Jennifer Lopez's 8-year-old twins went for two very different — but equally cute — costumes: Bowser from Super Mario Bros. and a cat.

Gisele Bundchen and her adorable son also opted for a Super Mario theme.

Jessica Alba and her 5-year-old daughter, Haven, dressed as the duo from Nickelodeon's "Shimmer and Shine."

Chrissy Teigen was among the first to get in on the action, sharing several photos of 6-month-old Luna getting into the spirit in the days leading up to Halloween.

For more Halloween fun, check out these adult celebrities' costumes!