Hallie Kate Eisenberg
Famous sibling: Jesse Eisenberg
"The Social Network" star's little sister is something special, actually. Remember those late-'90s Pepsi commercials with the dimple-faced girl who often kindly squeaked, "I'll have a Pepsi, please." That's this girl! True story. Tell it at parties. —XFINITY Entertainment Staff (Photo by Kevin Kane/Getty Images for Elizabeth Glaser Pediatric AIDS Foundation)
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