- Played by: Jessica Lowndes
- Episode 14-, previously recurring
A theatre student who is Naomi Clark's best friend. She suffers from a serious drug addiction and is under a lot of strain to further her career. After she overdoses, she receives help for her drug addiction from Navid, who pays for her to go to a renowned rehab center for the best treatment possible. As a result, she starts spending more time with him and they begin a relationship. After discovering one of her ex boyfriends has relapsed after finding out he was HIV positive, she undergoes a test. She is negative for HIV, however, the results do reveal she is pregnant. The paternity is unknown for some of the season. Navid's virginity rules him out as the father of her unborn child, however, she has stated she had sex with various men during her addiction. She and Navid break up as she reveals that she is pregnant in "Love Me or Leave Me". In "By Accident", we find out that the baby's father is not Hank (whom she had slept with a few times when she was in rehab), but Ty, her co-star in the school play. In "By Accident", she does not take the pregnancy well. Naomi says she thinks she should get an abortion while Kelly thinks she should raise it or give it up for adoption. She drives all night and ends up at a clinic, where they tell her she's too far along to get an abortion. Naomi supports her after Adrianna tells her. Naomi convinces her to tell Ty, and he tells his parents. Ty's parents tell Adrianna that they will pay for the doctor and other things like that. They also said that when she starts to show, they will send her to a retreat in New Mexico, so that nobody finds out. She readily agrees. Later, Ty gives Adrianna a contract which states that Adrianna must keep the whole pregnancy a secret. Her mother has to sign the contract. Unfortunately, Adrianna doesn't want to tell her mother, as she thinks that she will throw her out. Naomi convinces Adrianna to call Ty, as she thinks that the contract is unfair. Adrianna does, and Ty's mother comes over to Adrianna's house to discuss things with Adrianna's mother. Adrianna's mother, Ty's mother, and Adrianna sit down to talk and Adrianna tells her mother that she is pregnant. Ty's mother gets kicked out of the house due to arrogance and Adrianna no longer gets her help. Her mother talks to Adrianna and sort of apologizes for her being a bad mother and Adrianna forgives her. Adrianna goes to school and decides to tell everyone her "secret". She gets help from Navid, to announce through the school's video system and tells the whole school that she is pregnant. In "Of Heartbreaks and Hotels", Navid shows up at Adrianna's house and asks her to be his Valentine and she accepts. A few episodes later Navid proposes and she says yes. Later, at the prom, Navid and Ty scuffle and Adrianna goes into labor. She has a daughter whom she gives up for adoption. The new parents name her Maisie. In Season 2 Adrianna tries to change her life so she won't be know as 'drama Adrianna'. She and Navid have broken up because of her kissing her ex boyfriend Teddy. Which leads her back on drugs and jeopardizing her friendship with Naomi who finds the pill on her bed and storms out. After Silver's moms death she starts to change her life again free from drugs.