Famous as the host of such British television sports programs as Sky Sports News, Soccer AM, and 90 Minutes, she is also notable for presenting the programs Kirsty's Home Videos, Simply the Best, and RI:SE. In 2002, she was the recipient of the Television and Radio Industries Club Award for Satellite and Digital TV Personality of the Year.
After studying marketing and journalism at the London College of Fashion, she became a production assistant for Sky Sports.
She won the 2005 season of the reality TV program The Games and co-hosted several subsequent editions of the same show.
The child of Lesley Gallacher and multi-European- Tour-winning golfer Bernard Gallacher, she spent the first year of her life in Edinburgh, Scotland, and the remainder of her youth on the Wentworth Estate in Virginia Water, London, England. She has a brother named Jamie and a sister named Laura. Before ending in divorce, her marriage to rugby union player Paul Sampson produced sons named Jude and Oscar.
She and fellow British television host and sportscaster Gabby Logan are longtime friends.