On the season 4 finale of Rich Kids of Beverly Hills, Dorothy and Morgan work to repair their friendship as they prepare for Morgan’s wedding day.
The episode starts with Dorothy and Jonny talking at a frozen yogurt shop. She confides in him about Morgan and about her ex-boyfriend and NBA star, Quincy Pondexter. After Dorothy and Quincy hang out for the first time following their break-up, Dorothy says there is no more tension and will be friends.
With the wedding quickly approaching, Dorothy decides not to attend Morgan's bridal shower since she is still hurt about the comments Morgan made. Morgan confides in her mom and her mother tells her to be more careful about what she says.
Dorothy meets with Laura Baron, a relationship expert and tells her about the situation with Morgan and Bianca. Baron says Morgan needs to understand it can’t happen again but that Dorothy cut her off completely. Dorothy realizes Bianca used the information to hurt Dorothy with bad intent instead of telling her to genuinely help her.
A week before the Rich Kids wedding, the weather forecast says it might rain on the wedding day. To be on the safe side, Brendan and Morgan go to the wedding venue where Brendan decides to rent a luxury tent.
Later, Dorothy and Morgan meet for dinner and Morgan says she missed her at the bridal shower and again apologized for the comment. Morgan says she never meant the comment to be malicious. After the two have a long talk, Morgan says she wants the two to be friends and for Dorothy to be in her wedding. Dorothy agrees to take baby steps and move forward with their friendship.
EJ and Morgan go shopping for lingerie and Morgan says she is having anxiety about getting married. EJ encourages her to go to New York with him to de-stress a week before her wedding. While in New York, Morgan says she feels like she had a meltdown. She is quickly reminded that she loves Brendan and is excited to get back home to him and get married.
To celebrate Jonny’s birthday, Dorothy and Jonny's friends go to a few bars in West Hollywood. Bianca shows up to a bar and says she wants to patch things up with her stepbrother and Brendan. Dorothy says she doesn’t think things will be okay between her and Brendan since she attacked Morgan in the previous episode. The two sit aside from the others and Dorothy confronts Bianca about the drama and says she is manipulative. After Dorothy sticks up for herself, Bianca leaves the bar.
On the wedding day, Brendan and a few friends and family fly into the venue. Dorothy decides to attend the wedding and is at the venue as her bridesmaid. Brendan is nervous but says all his fears go away when he sees Morgan. After emotional vows, the couple gives each other their rings and are offcially married. After the two have their first dance, there is a video montage about the two of them from previous seasons
The Rich Kids of Beverly Hills season finale ends with Dorothy and Morgan getting emotional and saying how much they care about each other. During a confessional, Morgan says she is happy to be truly lucky to marry her best friend.