- „Just call me karma, babe. And karma is a bitch.”
- —Jen Clark in Multiple Choices
Jen is the daughter of Charles and Tracy Clark, and has a younger sister named Naomi. She returned to Beverly Hills following a departure to attend Yale University and travel Europe, reuniting with her father, her sister, and a number of other people.
Following her return, Jen had a brief encounter with Ethan Ward, Naomi's ex-boyfriend, in which she claimed to have secretly been his "first." Soon afterward, she and her sister met with Charles, who Naomi had been separated from following his split with Tracy. Jen pressured Charles to give Naomi early access to her inheritance, and Charles was ultimately forced to agree. Jen then began a relationship with Ryan Matthews, a young teacher at her old school, West Beverly High. She and Naomi also planned to buy a home together, intending to share the cost. However, when Jen claimed to be having financial difficulties, Naomi took care of the cost herself, with Jen stating that she'd pay her back later. After the sisters had moved in together, Naomi eventually confronted Jen as additional expenses mounted. Jen revealed that she was having greater financial misfortunes than she'd let on, and Naomi became sympathetic.
Jen joined Naomi at the West Beverly Prom, dating Ryan while he was on duty. At the event, she was reunited with her old guidance counselor, Kelly Taylor, who had recently dated Ryan as well. Tension abounded between the women, due largely to Kelly holding a low opinion of Jen's personal character. After the prom, Jen received a phone call which left her frustrated, prompting her to state that she was actively pursuing a divorce. Later, Jen became resentful when Naomi claimed control of the house and threw an after-prom party. Earlier in the evening, Naomi had attended the prom with Liam Court, who'd asked her to keep their personal discussions private. However, he was unaware that Naomi had already revealed things about him to Jen. Upon discovering this later, Liam was left to believe that he'd been betrayed. He then followed Jen to bed, where the two acted on their mutual spite for Naomi.
Upon finding Liam half-naked, Naomi left the room after declaring their relationship over. Liam then became remorseful when Jen identified herself as Naomi's sister. Believing Annie Wilson to be the other girl, Naomi chastised her out in the open. This prompted Annie to leave the party while reporting the underage drinking to the police.
Later, Naomi was "comforted" by Jen. The party came to an end, however, when police officers arrived on the scene.
Season 2EditJen continued to manipulate and sponge off her sister Naomi for several months. She kept Liam from telling Naomi the truth about Prom Night by approaching his mother. Unbeknownst to Jen, Liam recorded one of her confession/threats on his cellphone as proof, but later erased it.
Jen and Ryan continued to date in an open relationship which allowed her to date richer boyfriends for perks, but she got jealous when Ryan started dating a bartender. Jen and Ryan decided to be exclusive and bonded over a failed camping trip.
Under the guise of divorcing her husband, Jen took a large sum of money from Naomi to buy a racing horse of all things. At some race the horse took first place and won the grand prize. At the same race several of the high school students set up an elaborate Oceans 11-type stunt to ruin Jen. Naomi overheard Jen reveal everything to Liam and told Jen to get lost. Ryan also caught Jen in a lie about receiving the horse as a gift, and also learned she'd slept with Liam, which led to him breaking up with her.
Jen returned to Los Angeles with her husband Olivier Le Sage, who bought Naomi's house and the beach club for Jen. Jen also managed to convince her father to let her control Naomi's finances until Naomi is an adult. Naomi told Olivier about Jen's affair with Liam. After cheating on Jen, Olivier paid her $16 million dollars as part of their reconciliation cause. Naomi chased Jen straight into the OB/GYN where she finally found out Jen was with child, spotting a previously unseen baby bump.
In the fifth episode of Season 3, Jen gave birth to Ryan's child. She and Ryan shared a brief kiss after the birth of their son. Jen soon left town leaving her son Jack to live with his father Ryan after realizing she was a bad mother.
Jen appears with her surrogate son in Naomi's house at the end of sixteenth episode.Naomi mentions to Jen that she started her own business, Naomi Clark Events, and Jen continues to act like she could care less. William Paddington, Naomi´s client shows up with Jen. Jen flirts with William while Naomi does her presentation. William stops Naomi mid-presentation to tell her he’s hiring her and to set up a date with Jen.
After Jen confides in Naomi about her fear that she’ll end up alone in life, Jen leaves to go out with William and asks Naomi to babysit Jacques while also planning her event. After Jen and Williams bail Naomi out, Naomi gives William his wedding ring. Jen tells him he’ll let Naomi plan the party or she’ll call his wife. Later, Naomi tells Jen she wanted to impress her and Jen tells Naomi her whole life is impressive.
Jen is with the girls at Naomi’s for a tarot card reading. Jen tells everyone she met a man while playing tennis and Naomi tells everyone she thinks PJ may be “the one”. Naomi tries to impress PJ, Jen comes out and we find out the guy she had a connection with at the club was PJ. The girls argue over who has dibs, and then Jen says whoever PJ asks out will get him. The truce ends when Naomi spills tea on Jen’s dress, w Later, Jen gives Naomi some moisturizer from France as a peace offering. Naomi thinks the moisturizer is tainted, so she goes to get another in her bathroom and Jen locks her in there.
Jen overhears the conversation between Naomi and Annie. Naomi goes to the music festival and finds out Jen switched “the dress” with a clown outfit. Jen shows up in “the dress” just in time for PJ to show up. PJ soon excuses himself, as he has a emergency call about his vineyard. Jen and Naomi later argue, again, and accidentally fall into a mud pit, which they thn wrestle in. Someone random knocks Annie in too, so she yells that PJ left for Napa an hour ago to Naomi and Jen. Naomi and Jen then apologize to each other and say they’re jealous of each other. Jen then tells Naomi that she’s leaving for LA with Jacques. Annie later hands Naomi a letter that Jen left. The letter says that she’s going to Napa.
Jen returns from Napa to a furious Naomi. Jen says she had a horrible flight back and Naomi doesn't believe her until Jen throws up. Naomi thinks Jen is making this all up so she can just lounge around at Naomi's. Naomi shows Jen a box of some old things, including a picture of them when they were little at Naomi's birthday party and Jen is wearing Naomi's birthday dress. Naomi also shows her a letter Jen wrote to her with the floor plan of their new house and showing that her bedroom is the one with the smallest closet. Jen later tells Naomi that she did these things because she cared for her; that the dress would really look awful on Naomi and the bedroom was the only one where you couldn't hear their parents shouting. Jen leaves the next day, making Naomi think she has lost her. Later, Jen calls Naomi while Naomi is in bed with PJ and they reconcile, but Jen tells Naomi that PJ has a 'scandalous secret' and that it was good that neither of them got with him leaving Naomi feeling uncomfortable.
- Jen had her eye on three of Naomi's ex-boyfriends: