GMTV anchor Kate Garraway will take on the job of entertainment editor when the breakfast show is revamped to become Daybreak - but regulars Carla Romano and Richard Arnold are to quit.
ITV1 unveiled details of the new on-screen line-up which will see former One Show stars Adrian Chiles and Christine Bleakley at the helm.
The broadcaster said that Garraway's new role will entail "covering the major stories in the world of showbusiness and culture".
Garraway will anchor entertainment news from the studio as well as conducting A-list interviews and covering exclusive showbiz events, ITV1 said.
Garraway said: "This is a fantastic opportunity to spread my wings in an exciting new role. Showbusiness is big business and Daybreak will be the place for all the big interviews and stories."
Steve Hargrave will join Garraway as entertainment correspondent.
ITV1 said that as part of the changes, Romano and Arnold have decided that they will not be part of the Daybreak team.
Los Angeles-based Romano described her time at GMTV as like a "rollercoaster... exciting, scary, hilarious and unpredictable".