<p><br /> X Factor star Diana Vickers has achieved her first number one with debut solo single, 'Once'.<br /> </p><p><br /> She reached the semi-final stage of the show in 2008 and after receiving critical acclaim in a stage adaptation of Little Voice, has returned to her pop beginnings.<br /> </p><p><br /> She has collaborated with other major femalE newcomer Ellie Goulding on her new album, as well as Light Speed Champion.<br /> </p><p><br /> Her mentor on the hit talent show was Cheryl Cole and despite not making the final of the, she is now set for a career coming up against the Girls Aloud star in the singles chart.<br /> </p><p><br /> She admitted to us that she is looking to go back into acting again when she has become more established as a recording artist, citing her ideal role as being in a Tim Burton and Johnny Depp movie.<br /> </p>