“The Importance of Being Ernest,” based on the play by the same name by Oscar Wilde, stars Colin Firth, Rupert Everett, and Reese Witherspoon in a madcap Victorian comedy that features mistaken identities, crazy aunts and true love. Jack Worthing (Firth) invents a brother named Ernest in order to escape to the countryside every now and then, while his friend Algernon Moncrieff impersonates his brother in order to win the heart of the woman he loves, who happens to be none other than Jack’s ward, Cecily Fairfax (Witherspoon.) Many twists and turns later, a long-lost secret reveals everyone’s true identities and truly teaches everyone the “Importance of Being Ernest.”