She started her television career as a presenter on HTV West. From 1997-2001, she presented Newsround; after leaving this, she presented Watchdog with Nicky Campbell. She was famously impersonated by Ronni Ancona on The Big Impression. Gerbeau left Watchdog in 2004. She also presented The Heaven and Earth Show. Gerbeau was also a newsreader on BBC Breakfast and also presented the news on Breakfast with Frost.
In December 2004 she joined Five, and co-presented the two-hour long Golden Mummy Tomb Opening Live with Guy de la Bédoyère from Bahariya in Egypt's Western Desert, featuring the Egyptian archaeologist Zahi Hawass. She was a newsreader on Five News, until the birth of her daughter.
In July 2008 Gerbeau presented a documentary TV series on Five – Wild Animal ER – about Tiggywinkles, the animal welfare charity and veterinary hospital.
She had a relationship with television presenter Krishnan Guru-Murthy. Gerbeau married entrepreneur businessman Pierre-Yves Gerbeau in 2005. On 1 November 2008, she gave birth to their first child, daughter Chloe, after three miscarriages.