Tory MP Nadine Dorries's exit from the jungle and Hugo Taylor's successful Bushtucker Trial gave the show a peak of 10 million viewers.
Meanwhile, ITV's 90-minute instalment overall averaged 9.02m (36.6%) and 396,000 on ITV1 +1.
At the halfway stage of the competition, I'm a Celeb's 12th series is 400k more popular than 2011's run.
I'm a Celebrity... Get Me Out of Here! Now! followed on ITV2 with 663k (3.9%) at 10pm (+1: 104k).
Over on BBC One, Supersized Earth (3.79m/15.7%) and Crimewatch (3.1m/10.6%) held up reasonably well, while MasterChef: The Professionals (2.51m/10.4%) and The Hour (1.12m/4.6%) aired on BBC Two.
Channel 4's Grand Designs dipped to 1.42m (5.8%) at 9pm (+1: 257k), but got the better of The Transporter on Channel 5, which had 929k (4.3%) and 150k on timeshift.
Overall, ITV1 dominated primetime with 32.6% (+1: 1.1%), achieving double BBC One's share of 15.8%. BBC Two predictably followed with 6.4%, ahead of the fourth placed Channel 4 which had 4% (+1: 0.4%). Channel 5 finished last with 3.1% (+1: 0.2%).
Ahead of ITV2's I'm a Celeb spinoff, Doc Martin was the night's most-watched multichannel show with 832k (3.4%) for ITV3.
BARB ratings data supplied by Attentional