Daughter of professional footballer and wrestler Orig Williams,[4] Bethan was brought up in Llansannan and Rhyl.
She later graduated with honours from Ivor Novello - Redroofs Theatre School, where she won "Most Promising Performer of the Year".
[7] In 2004, she appeared as Laura in the series Emyn Roc a Rol and had a role as temptress Kelly in Footballer's Wives in a 90-minute special.
[7] Her debut album Does Neb yn fy Nabod i features her own, and eight compositions by Gwenno Dafydd and Heulwen Thomas, released on the Sain Records label.
From 2018, Bethan has been one of three main Welsh judges (alongside Connie Fisher and Stifyn Parri (series 1) / Lloyd Macey (series 2) ) on the panel of Junior Eurovision: Chwilio am Seren (English: Search for a Star), a singing competition organised by Rondo Media and broadcast on S4C, to select an entrant aged 9 to 14 to participate in the Junior Eurovision Song Contest 2018, representing Wales.