Seriously ... this is the BEST! Who knew Kim Kardashian was such a good actress!

The reality star/makeup entrepreneur/underwear goddess posted this hilarious recreation of Reese Witherspoon's iconic role as Elle Woods in Legally Blonde, hinting that this is her scholarly-appropriate Halloween costume as a student of law herself!

While Kimmy may not be legally blonde, she sure does well in recreating Reese's looks -- check out the gallery she posted ...

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Legally Blonde

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Meanwhile, Kim's got competition from sis Kylie who posted pix of her FOURTH Halloween 2019 look today!

Her Marilyn Monroe costume is actually part of V Magazine's first video cover, which features the young billionaire.

Her other looks so far this year are Ariel from Little Mermaid, a Playboy bunny (both featured below), and Madonna. She's one busy lady!