[28] On May 12, 2011, it was announced that former Life Unexpected executive producers Patti Carr and Lara Olsen had been hired to take over the series.

[42] 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.

[47][48] 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.

[49] Cameron Goodman also secured a recurring spot role, playing Bree a college student who convince Annie to work as a professional escort.

Brooklyn-based rapper, Theophilus London, made a guest appearance while performing at Naomi's College Kick-Off party in her new mansion, in the season premiere.

[50] Drew Seeley was cast in the series, but was later replaced by Supernatural actor Matt Cohen in the role of Jeremy.

[52] Former Buffy the Vampire Slayer star, Sarah Hagan, will play Alana, a member of the sorority Naomi joined in a recurring role.

Her character Marissa Harris-Young,[54] who is due to make her debut in October, is said to be a young politician hoping to get elected to congress.

In order to increase her chances, Marissa hires Silver to make a campaign video aimed at young people.

[56] Kellie Pickler is set to make her acting debut as Sally, the country-singing cousin of local cowboy Austin.

[58] 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".

[59] Former Nikita star, Tiffany Hines has landed a recurring role as a police officer called Kat.

[61] Billy Ray Cyrus has been cast as Austin's father, Judd Ridge, a country and western star.

Online confirmed that Eureka alum Niall Matter would join the cast as Greg, a new love-interest for Silver.

[63] Janice Dickinson will appear as herself in a November episode, as a famous fashion celebrity judging student competition.

[64] Original Beverly Hills, 90210 star Dina Meyer appeared as a modeling agent who takes a special interest in Liam's career.

[65] Michelle Hurd will appear as a guest star playing Rachel, Naomi's boss and Holly's mother.

Arielle Kebbel will join the series in a recurring role in December as Vanessa, a girl with a rather promiscuous past who still, occasionally finds herself making risky choices.

[68] Entertainment Weekly reported that Sara Foster would return for three episodes in the latter half of the season, as Naomi's sister Jen Clark.

[69] Nick Zano was also cast as Preston Hillingsbrook, a playboy with a lot of cash to blow as the heir to his family's fortune.

[71] Step Up 2 actor Robert Hoffman will guest star Caleb, a student at seminary school studying to become a priest.

[77] Executive producer Patti Carr revealed that Naomi will buy an over-the-top mansion that she'll turn into a sorority house where friends such as Annie, Silver and newlyweds Ivy and Raj will live.

[84] Matt Lanter revealed in an interview with Entertainment Weekly that the fall finale will end with a life or death situation with Liam.

As well as every episode from the season, the DVD release features bonus material such as deleted scenes, gag reels and behind-the-scenes featurettes.