Freakier Friday

Twenty-two years after the body swapping incident, a now adult Anna Coleman works as a music producer and raises her teenage daughter Harper as a single parent with the help of her mother Tess. At school, Harper is constantly annoyed by her new classmate Lily Reyes, due to her snobbish personality.
After Harper and Lily cause an incident in chemistry class, Anna is called to the principal's office. When she meets Lily's widowed father Eric, they fall in love and become engaged six months later. The soon-to-be stepsisters are dissatisfied with their predicament; Harper is worried that her mother will relocate them to London, while Lily is adamant to return there so she can attend a fashion academy in honor of her deceased mother.
During Anna's bachelorette party, Anna and Tess and later Harper and Lily have separate palm readings from the supposed psychic Madame Jen, who tells Harper and Lily a fortune about their fractured lives. An earthquake then occurs, which only the four feel. The next morning, they discover that they have switched bodies: Anna with Harper, and Tess with Lily.
The experienced Anna and Tess advise Harper and Lily to pretend to be each other rather than telling anyone about the switch until they can change back. Realizing their new identities could help them break their parents apart, Harper and Lily lie about Madame Jen giving them a reading to delay the reversal. Anna and Tess go to school and spend time in detention for a food fight that Harper and Lily caused at a bake sale, while Harper and Lily enjoy the advantages of being adults and come up with a plan to sabotage the wedding.
At a photoshoot for Anna's client, aspiring singer Ella, Harper and Lily help her overcome her recent breakup. Ella tells them about Anna's former rock star dreams and they find a love song, which they assume Anna wrote about her high school ex-boyfriend Jake Austin. Upon finding him, Harper embarrasses herself when unsuccessfully trying to seduce him in Anna's body.
After escaping detention, Anna and Tess find Madame Jen, who reveals Harper and Lily's fortune but warns them that all four of them need to "change their hearts" in order to change back. Harper, who attends the immigration interview with Eric in Anna's body, realizes how much Eric loves and cares about her mother. Eric also tells her that it would be best for their families to stay in Los Angeles, causing Harper to have second thoughts about ruining their wedding. Lily, however, remains determined, and invites Jake to the rehearsal lunch. She makes a scene in Tess's body, leading to a heated public argument and Eric calling off the wedding. Following a heartfelt conversation with Tess about her homesickness and the loss of her mother, Lily starts to realize the error of her ways.
As Tess, Lily tries to convince her father not to give up on Anna. At the same time, Anna, followed by Harper, is called to Ella's concert, learning that Ella invited Anna's old band, Pink Slip, so they could perform together again. Although happy for the reunion, Anna tells Harper she never regretted giving up her singing aspirations because Harper is the best decision she ever made, revealing that the love song was actually written about her.
Anna and Harper perform the song together on stage, and Tess and Lily arrive in time to see them, with Lily happily stating she wants to be a part of the family. With Harper and Lily's change of hearts complete, they all return to their original bodies. Eric arrives to the concert, and he and Anna rekindle their relationship.
The wedding is held the next day. Sometime later, the family attends the launch event of Tess's latest book. Tess is shocked to learn that Lily, while she was in her step-grandmother's body, took an unflattering picture of her for the book's cover with Tess's lips swollen by an allergic reaction.