Emma Crosby, who began her career as a BBC News producer before working on London radio station LBC, said she was "absolutely thrilled" to land the job with GMTV.
The station have said "presenting duties will be split equally between all four presenters"
Emma has also worked on ITV's local news in London and the south of England. She will already be used to early starts as a presenter on Sky's Sunrise programme.
She was on-air during the terrorist attack on Glasgow Airport in June 2007, helping Sky News to a Bafta for its coverage of the incident.
Emma said "I am very excited to be joining Britain's leading breakfast programme and working alongside Kate Garraway, who is a great talent."
Kate said: "It's great news that Emma is joining GMTV. We now have the greatest gang of four in TV and I am sure viewers will love our new look."
Fiona Phillips joined GMTV when it launched in 1993 as an entertainment correspondent. Fiona is leaving to spend more time with her family.
GMTV also announced that Kirsty McCabe will replace weather presenter Andrea McLean, who is leaving after 11 years.
Copyright Speakers Corner 2017