In the season finale, Jenn returns from the Bahamas and announces her engagement. Alexis and Katie host an engagement party where Heather and Emily confront Katie over allegations made about Emily's twins, leading Katie to reveal she has more proof that Heather is liar. Gina and Travis discuss the future of their family. Ryan makes headlines when his name is involved in a national bombshell that sends shockwaves in the OC.

The reunion continues with Jenn questioning her rocky friendship with Tamra while taking heat for her financial choices. Emily addresses Heather about the fashion show fallout. Emily and Heather interrogate Katie about her daughter's social media antics. Alexis Bellino joins the women on the reunion stage.