J.T. Hellstrom and Colleen Carlton are fictional characters and a supercouple from the American CBS soap opera The Young and the Restless. J.T. was portrayed by Thad Luckinbill, and Colleen was portrayed by three different actresses during the pair's reign, including Lyndsy Fonseca, Adrianne León and Tammin Sursok. They are often referred to by the portmanteau "Jolleen" by fans on internet message boards and in magazines.
Beginning as a controversial pairing due to the characters' age gap, their pairing would soon gain popularity, characterized as "Genoa City's sweetest supercouple". Former head writer and executive producer John F. Smith pushed for a story between the characters despite the unexpectedness and controversy surrounding them. Luckinbill's music ability was an element in their storyline as the actor wrote and performed two original songs for the soap opera. The song "When You Say Nothing at All", performed by Alison Krauss, also appeared in their storyline.