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Tammy announces her engagement to the family and reveals that her big day is only two weeks away; Amy takes up maid of honor duties; the family wonders if there's another reason Tammy is rushing down the aisle.
Tammy wants to come home, but a setback causes a major blowup between her and the family; when a new man enters Tammy's life, all bets are off; Amy feels the stress of motherhood; Amanda contemplates a new chapter.
It's Tammy's wedding day; Amanda and Misty take Caleb to task over his true intentions; Amy struggles to get the venue decorated and keep her emotions in check; a wardrobe malfunction and a case of cold feet threaten to derail the nuptials.
After surviving a near-death experience, Tammy struggles to cope with her new reality. Then, she makes a life-altering decision, one that no one saw coming. With baby number two on the way, Amy feels her family is complete, but she soon realizes being an overweight mom may prove to be too much. Chris is desperate to get rid of excess skin and qualify for skin removal surgery, while Amanda offloads some dead weight of her own.