The Sister Looks Like Jennifer Love Hewitt.
Kat, the Sister, Looks A Little Like Jennifer Love Hewitt.
At least enough to be JLH's older sister.
Kat as played by the actress Hillary Matthews even had her hair in a similar style to JLH.
Her appearance in the film made this movie much better.
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Sig Line:
Many cynics and skeptics mistake their hubris negativity for actual intelligence.