PJ proposes to Naomi and Annie discovers he needs to get married in order to get the rest of his trust fund. Dixon confesses to Navid that he signed a record contract but admits he did not tell Adrianna because the label didn't want to sign her. Dixon also accepts a gig to play back up for Haley Reinhart, but doesn't tell Adrianna. Liam asks Vanessa to move out and discovers she has emptied their joint bank account.
Season 4 Episode 20 of 90210 resulted in a 0.00 rating in the 18-49 demographic.
The series revolves around the three-generational Wilson family who have recently moved to Beverly Hills, California after the father Harrison Wilson accepts the position of being the principal of West Beverly Hills High School.