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Cameron made her entrance in a cute knitted Valentino mini LBD - complete with flouncy hemline and leg lengthening nude courts.
But while Cam went short, J-Lo went for long with her stunning 70s inspired Maria Lucia Hohan satin maxi gown. Deep burgundy lips and sleek pony added extra vamp to her look.
And brightening up the premiere was co-star Brooklyn, who worked a yellow floral print tunic dress by Giambattista Valli.
The gorgeous trio joined fellow stars Matthew Morrison, Elizabeth Banks and Anna Kendrick on the red carpet.
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