It's Complicated (2009)

Jane and Jake are divorced and share three adult children, but they have moved on with their lives: she runs a bakery and he, a lawyer, married a woman named Agness. However, a reunion is the excuse for their romantic relationship to resurface; at the same time, Jane is conflicted because she is attracted to Adam, an architect and regular client. Directed by Nancy Meyers, the film explores the challenges of middle-age love with humor, which is why the triad between Streep, Baldwin and Martin works so well.