Imogen Mary Thomas (born 29 November 1982) is a Welsh glamour model, beauty queen and television personality. She rose to fame in 2003, after winning Miss Wales, and achieved further note in 2006, when she lasted three months on the seventh series of reality TV series Big Brother.

Imogen was born to Charles Thomas, an education welfare officer, and his wife Janette in Gorseinon, near Swansea, South Wales. Her parents separated when she was two years old, and, after her mother remarried when she was six, she was brought up by her mother and step-father in Llanelli, South Wales. She speaks Welsh fluently. Thomas has a sister, Alana. Thomas developed alopecia when she was six, losing chunks of her hair.

Thomas started working as a model at age 13, and at the age of 17 moved to London to become a professional model. Working in bars to pay for her living costs, she was rejected by many modelling agencies due to her height.^{[citation needed]}

She reluctantly returned to her studies, and gained a degree in Health studies and Psychology at the University of Worcester. During this period she entered beauty contests, and was crowned Miss Wales in 2003, beating future Big Brother 9 winner Rachel Rice, who came third. She went on to represent Wales at Miss World in China. This prompted her to return to London to try glamour modelling, and also working as a bar hostess at London's Sanderson Hotel.