90210 (season 5)
On January 13, 2013, the President of The CW Mark Pedowitz stated that although "90210" doesn't have a season 6 renewal in place, the show would most likely be back next year (possibly for the final season if it were to be canceled) due to him being a "big believer in giving fans a very satisfactory conclusion" for long-running shows. In spite of this, in late February it was announced that the fifth season would indeed be the final season of the show, with the series finale airing May 13, 2013.On June 30, 2012, The CW released the first promotional ad for the fifth season. However, no new scenes featured in the 30 second ad, but rather recapped the final episode of season four. On August 23 at the 90210 launch party for season five, a new 30 second ad was released, showing brand new scenes of the upcoming season, including Justin Deeley's scenes. The CW then released another brand new promo for the fifth season on 11 of September, featuring more new scenes form the upcoming premiere, and brand new graphics for the shows promotional campaigns. On September 27, 2012, the cast and crew celebrated their 100th episode in Manhattan Beach, California.
90210 (season 4)
Before the end of the third season, it was announced that Lori Loughlin and Ryan Eggold would not be returning to the series' fourth season. However, Loughlin has already been asked to return for "some episodes," by the former CW president, if her schedule permits it. The CW press release for their 2011–12 season, included all cast members Shenae Grimes, Tristan Wilds, AnnaLynne McCord, Jessica Stroup, Michael Steger, Jessica Lowndes, Matt Lanter, Trevor Donovan and Gillian Zinser. AnnaLynne McCord confirmed in an interview with "Entertainment Weekly" that the cast would be cut down by the new showrunners, though McCord was assured she would be back. Trevor Donovan was the first cast member to be dropped as a series regular for the fourth season, although, he will return as a guest star for five episodes in the Fall. Manish Dayal will be returning to the series in a recurring role as Ivy's dying husband, Raj. Donovan will be the only series regular dropped from the series. Five new recurring characters will be introduced in the Fall. Austin, described as a charming and hunky cowboy and the son of a country music superstar. Holly, Naomi's rival at California University. Jeremy, a student at CU who forges an immediate connection with Annie, but may have an ulterior motive. Jane, a young widow and love-interest for Liam, and Leila, Navid's younger and trouble making sister. Producers are also looking to cast Navid's uncle, "Amal" who was also his fathers business partner. He is described as charming on the surface, but a bad guy and somebody "you don't want to mess with." Kristina Apgar, Megalyn Echikunwoke and Justin Deeley were later cast as Jane, Holly and Austin. Stephen Amell also reported that he signed to appear on the show for at least two or more episodes playing Jim Conrad who will get involved with Liam's life. Josh Zuckerman will return as Naomi's boyfriend, Max, for a handful of episodes. Cameron Goodman also secured a recurring spot role, playing Bree a college student who convince Annie to work as a professional escort. EW has reported that Brooklyn-based rapper, Theophilus London, will make a guest appearance while performing at Naomi's College Kick-Off party in her new mansion, in the season premiere. Drew Seeley was cast in the series, but was later replaced by "Supernatural" actor Matt Cohen in the role of Jeremy. Freddie Smith will not return as Teddy's boyfriend, Marco, as their relationship ended over the summer. Former "Buffy the Vampire Slayer" star, Sarah Hagan, will play Alana, a member of the sorority Naomi joined in a recurring role. 
R&B singer, Brandy Norwood will have a major arc in the fourth season. Her character Marissa Harris-Young, who is due to make her debut in October, is said to be a young politician hoping to get elected to congress. She is running against the conservative uncle of Teddy. In order to increase her chances, Marissa hires Silver to make a campaign video aimed at young people. Sean Wing has landed a role as a recurring guest star. His character Nick is described as a "scruffy-handsome" graduate student with an interest in photography. Nick, who works for National Geographic, is also said to be charming and a traveler. He ends up falling for one of the female characters, but she is already in a relationship. Kellie Pickler is set to make her acting debut as Sally, the country-singing cousin of local cowboy Austin. Former "Gigantic" star, Ryan Rottman, will guest star as Shane, a smart, handsome gay 20-something who is confident in his identity and is committed to fighting for marriage equality. Chris McKenna has signed on for multiple episodes to play Patrick, a businessman who falls for Annie, he is described as "rich, powerful and very charming". Former "Nikita" star, Tiffany Hines has landed a recurring role as a police officer called Kat. Jersey Shore's Vinny Guadagnino will guest-star as a celebrity who gets involved in a high-stakes poker game with Liam. Billy Ray Cyrus has been cast as Austin's father, Judd Ridge, a country and western star. His episode will air in November. E! Online confirmed that "Eureka" alum Niall Matter would join the cast as Greg, a new love-interest for Silver. Janice Dickinson will appear as herself in a November episode, as a famous fashion celebrity judging student competition.