The band are the latest addition to the popular festival.
Perhaps best known for their 2006 album Two Stops from Home, which peaked at Number 2 in the UK Album Chart and featuring singles Sewn, Never Be Lonely, Fill My Little World and Love It When You Call, their second album (2008's Join with Us) actually debuted at Number 1.
The indie rockers, originally from Horsham have continued to release music since then - most recently last year's album San Vito.
They'll be headlining the Saturday at Chiddfest, taking place at Nash Street in Chiddingly from 18-20 July.
Early Bird tickets remain available until the end of this month.
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