The two talented Brit actresses did themselves proud in the fashion stakes; and we especially love Knightley's spangly nude knit Chanel Couture dress with delicate beaded detailing, which looked picture perfect with her new bob hairstyle.
Meanwhile Carey donned a black, white and red colour block halter dress from Vionnet's spring/summer 2011 collection and Giuseppe Zanotti for Vionnet gold wedges. Ms Mulligan is clearly a big Vionnet fan and wore the designer earlier this year on the red carpet at the BAFTAs this year.
Which of these ladies' looks do you prefer? Leave a comment below and let us know!
In related news, check out the super-chic outfits that the two actresses rocked earlier in the day.