The 90-minute show peaked at 10.3 million and 44.9% share at 10pm, as ex-Busted singer Matt Willis became the "King of the Jungle".
Nearly half of the 16-34 year old audience watched the show, drawing in 49.5% of that age group who were watching television at that time.
Viewing figures were lower than previous finals of the reality show. In the last series, which saw Carol Thatcher take the title, 12.3 million tuned in a similar 9pm slot last December.
On the other channels, BBC One managed 5 million and a 21.2% share with Have I Got News for You at 9pm.
The channel's new sitcom Jam and Jerusalem dropped nearly 3 million viewers, managing just 3.9 million for its second episode. The Jennifer Saunders sitcom attracted 6.7 million viewers to its opener last week.
A combination of the I'm a Celebrity final and a double bill of Coronation Street gave the ITV its third highest peaktime share of the year, with 35.8% between 6pm and 10.30pm.
BBC One managed a peaktime share of 22.2%. EastEnders was the BBC's highest rated programme with 9.5 million and a 43.3% share at 8pm.