Keira Knightley is back on the red carpet. The Pride and Prejudice star looked straight ... she wore a black slip dress courtesy of the French fashion house. While the timeless gown appears ...

Keira Knightley ... a mutual friend, the Pride & Prejudice star and former Klaxons keyboardist got hitched and welcomed two daughters, and Righton has remained Knightley’s plus-one for fashion ...