Kat Valdez (Jennifer Lopez) is half of the sexiest celebrity power couple on Earth with hot new music supernova Bastian (Maluma, making his feature-film debut). As Kat and Bastian's inescapable hit single, "Marry Me," climbs the charts, they are about to be wed before an audience of their fans in a ceremony that will streamed across multiple platforms. Divorced high-school math teacher Charlie Gilbert (Owen Wilson) has been dragged to the concert by his daughter Lou (Chloe Coleman, HBO's Big Little Lies) and his best friend (Sarah Silverman). When Kat learns, seconds before the ceremony, that Bastian has cheated on her with her assistant, her life turns left as she has a meltdown on stage, questioning love, truth and loyalty. As her gossamer world falls away, she locks eyes with a stranger--a face in the crowd. If what you know lets you down, then perhaps what you don't know is the answer, and so, in a moment of inspired insanity, Kat chooses to marry Charlie. What begins as an impulsive reaction evolves into an unexpected romance. But as forces conspire to separate them, the universal question arises: Can two people from such different worlds bridge the gulf between them and build a place where they both belong?