It's Complicated (2009)

Ten years after her divorce from hubby Jake (Alec Baldwin), Jane (Meryl Streep) has flourished. Now a successful business owner and beloved mum to the three kids she had with Jake, Jane is finally on good terms with her ex, who has married the beautiful and considerably younger Agness (Lake Bell). When they attend their son Luke's (Hunter Parrish) college graduation in New York, however, their passion for one another is unexpectedly rekindled, leading to atorrid affair that leaves Jane feeling reinvigorated, if a little guilty. With Jake on the verge of starting a family with Agness, the situation is more than a little messy and becomes further complicated when Jane meets Adam (Steve Martin), a divorced architect in the process of revamping her home. Sensitive and attentive, Adam could be the one for Jane, but her ongoing affair with Jake threatens to ruin her newfound happiness.

A humorous feel-good film with an exceptional cast, particularly with Meryl Streep's and Alec Baldwin's performances.