The two are joined by fellow stars Drew Barrymore and Jessica Biel on the list.
Although the list features a cross-section from the worlds of fashion, media and show business, it is expectedly filled with more movie actresses.
Knightley, who chose a recycled years-old knee-length dress over a new ball gown for her wedding dress, managed to look elegant in the outfit. Her understated bridal ensemble of a tweed jacket over the simple dress, matched with flats and sunglasses makes for an unconventional choice.
Like Hathaway, Barrymore also wore a big name designer's creation to her nuptials, a muslin-and-organza Chanel gown with matching cascading train designed by Karl Lagerfeld.
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For her wedding to pop superstar Justin Timberlake, Biel opted for a pale-pink Giambattista Valli custom-made creation.
The rest of the best-dressed brides list include women who married celebrities: literary agent Felicity Blunt who wed actor Stanley Tucci, PR maven Amanda Sheppard who got married to British rocker Bryan Ferry and yoga instructor Hilaria Thomas who settled down with actor Alec Baldwin.