Britney documents some of the first funny, romantic moments with her future husband, Kevin. From a scary moment on a plane to their silly, casual behind-the-scenes flirting, it's obvious that their relationship is deepening, but Britney isn't ready to admit that it's love. Meanwhile, in the excitement before a show, Britney gets nervous about Kevin seeing her perform live onstage for the first time.

Skittish about her deepening relationship with Kevin, Britney turns the camera on herself and frankly expresses her fears, insecurities and worries about love and life, as Kevin starts to chip away at the walls she's put up by patiently supporting Britney between performances during her 2004 Onyx Hotel Tour. While mulling over her feelings, Britney decides to show how tough she can be by boxing with her security staff.

Britney and Kevin reveal how they kept their wedding day plans a secret, not only surprising fans, but even their family members and closest friends with the private ceremony they held in Studio City, California, last November. Meanwhile, Britney and Kevin's family and friends, including members of the wedding party, discuss how they arrived for a get-together and discovered the couple's true plans for the evening.

As her tour continues traveling through Europe, Britney realizes she's in love and that Kevin is the one. After a magical time in Paris, Britney and Kevin face some trouble at a Swiss border crossing. Later, the couple discusses their ideas about the perfect relationship and their new engagement.

Between performances during her 2004 Onyx Hotel Tour, Britney Spears focuses the camera on herself as she ponders the big issues of life---love, sex, marriage and commitment--with the offbeat people surrounding her. Britney finds herself particularly intrigued by Kevin Federline's honest and revealing opinions. Soon, Kevin becomes the new man in Britney's life. An excited Britney starts documenting their first romantic moments together, and confides her initial thoughts and feelings about Kevin to those closest to her.