Fun Valentine's Day romp between Phil and Claire's alter egos, Clive Bixby and Juliana, takes an unexpected turn that lands Claire in the hospital and with a diagnosis that she doesn't take lying down. Meanwhile, Gloria and Jay's attempts to be romantic keep getting interrupted by the kids, which drives Gloria crazy, and Cam and Mitch host a wild Valentine's Day Lonely Hearts Party that leaves them hung over the next morning, trying to piece together what happened and, more importantly, why Dylan is now living with them.

Mitch and Cam's best gal pal, Sal, makes one of her notorious surprise drop-ins, but this time with big news - she's getting married - tomorrow! Cam and Mitch are the best men, but they can't help but question whether this party girl can really settle down, and they consider an intervention. Meanwhile, Gloria has trust issues with their new nanny, Claire has a rare bonding moment with Haley, and Phil helps Luke with a girl he likes.