Kim started acting at the age of 8. Her first short was "2081" as an Orchestra Member, where she was the featured viloinist. She then appeared on major TV series such as "Bones" and "Sonny with a Chance" as a larger woman and a gospel singer. Yarbrough then appeared in the TV Movie "Dad's Home" as Doris. In 2010 she guest starred on "The Defenders" in the pilot episode as the Clerk. She then played a recurring character part of the Requisitions Officer in the TV series "Dexter". She later appeared in another TV movie, "Grace", and then a short, "Mushroom Pizza". She joined the recurring cast of "Conan" playing numerous characters from 2010 to 2011. She is currently working on another movie called "Somewhere Slow". Recently she has co-starred in episodes of "Vegas", "Hollywood Heights", and "2 Broke Girls". Kim will also be playing a recurring role as Madame Labuef on the new Nickelodeon television series, "The Haunted Hathaways".
Kim competed in the second season of The Voice. After having 2 judges turn around in the blind audition, she chose Adam Levine as her coach. In the battle rounds she sang "No More Drama" with fellow team-mate Whitney Meyer. After the battle, Kim was crowned the winner. In the live performances she sang "Rolling in the Deep" by Adele. In the eliminations, she was one of the bottom three on her team. For her song she chose "Spotlight" by Jennifer Hudson. In the end, she along with Karla Davis were eliminated. She came in 18th Place out of 48 contestants. She returned in the finale and sang "Superstition" alongside former contestants Naia Kete, Sera Hill and Cheesa.