All three singing group are said to be worth £11m each in the revise of music stars under 30 collect by The Sunday Times.
It exposes that X Factor star Cheryl Cole more than twice her wealth in 2009. Her personal fortune of £10m puts her in fourth place.
Cole's Girls Aloud band mates come combined ninth, with £5m each. Craig David, on £8m, is the uppermost man at seventh.
Church, who has only lately stepped back into the spotlight, also held the pinnacle slot last year in the list of under 30s.
The traditional singer, from Wales, launch a brief pop career in 2005, before touching into TV present and is now working as a moderator on Andrew Lloyd Webber's TV show Over The Rainbow.
Fellow Welsh singer Jenkins has also twisted her notice to TV, recently appear on the ITV show Popstar to Operastar.
Lewis, who has had two number one albums since charming X Factor in 2006, was located sixth in last year's list.
Cole, who comes into view at number 10, last year, boosted her chance by signing up to be an X Factor judge.