The first episode of an eight-part series captured a 29.8% share of the audience to win the 9pm-10pm slot.
It showed Kensit getting tearful as she found out about the shocking poverty her antecedents suffered and that her paternal grandfather served a prison sentence.
The programme was up against ITV1's live coverage of Liverpool Football Club's UEFA Champions League qualifier against Belgian outfit Standard Liege. The match, which ended 0-0, pulled in 3.4m viewers and a 15.5% share of the audience in the 8pm-10pm slot.
The latest instalment of Channel 4's 'Big Brother' had 2.7m viewers and an 11.6% share of the audience between 9pm-10pm. Including figures from Channel 4+1, the figures rose to 3.1m viewers and a 13.4% share of the audience.
The third part of BBC Two's Iraq drama 'House of Saddam' earned 1.8m viewers and a 7.6% share of the audience in the same slot.
Later on in the evening, the third part of Channel 4 documentary 'Dangerous Jobs for Girls', in which a group of women worked for eight days on a deep-sea fishing trawler in the South Australian Sea, netted 1.6m viewers and a 9.5% share. Including figures from Channel 4+1, it had 1.8m viewers and a 10.8% share.
Earlier in the day, BBC One's live coverage of the Olympics 2008, which included men's hockey and the start of the table tennis championships, scored 2.4m viewers and a 28.5% share of the audience between 12.45pm-5.15pm.
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