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The presenter, who has fronted the Channel 4 reality show since 2000, will launch her new career when the ninth series ends this summer.
She has sacked long-time agent John Noel in favour of Michael Foster, who spearheaded Billie Piper's transformation from popstar to respected actress.
A source told the News of the World: "She has finally realised the time is right to move on. After doing so many series of Big Brother, she's become seriously bored.
"She's very excited and convinced that Michael can turn her into a serious actor."
The 40-year-old will reportedly star in a major ITV drama later this year. She previously attempted to change direction with a role in ITV sitcom Sam's Game in 2001, but the show was cancelled after one series.
A Channel 4 insider said: "Davina has had to make some very hard choices. There is an understanding at Big Brother that it's very unlikely she'll be back.
"How many times can she keep on saying, ‘Big Brother House, this is Davina. You are live on Channel 4. Please do not swear'? This really is make or break time for her."
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