ITV said that the I'm A Celebrity final had a peak audience of 10.6 million last night, which was a 47% share of TV viewers.
The final show averaged 9.8 million, which was up 200,000 viewers on the audience for last year's final.
Overall series 12 of the show averaged 9.2 million viewers, making it the fourth most watched series ever, up on last year's series average of 8.9 million viewers, ITV said.
The X Factor drew a peak audience of 8.9 million viewers last night, and averaged 8 million viewers across the 90 minute show.
ITV1 said it was the most watched channel in prime time last night by more than a million viewers.
Ashley Roberts said she delighted to finish runner up behind Charlie Brooks in the final of I'm A Celebrity ... Get Me Out Of Here! as she never expected to get so far.
The former Pussycat Doll told hosts Ant and Dec: "I have gone beyond what I ever expected to get through in this competition, I'm so proud of myself."
Brooks was crowned Queen of the Jungle in the first ever all-female final.
Former Eastenders star Charlie Brooks has won I'm A Celebrity ... Get Me Out Of Here Now!
When asked by hosts Ant and Dec how she felt about being crowned Queen of the Jungle, Brooks responded with a smile, "Silly!"
Brooks said "not in a million years" would she have envisaged winning the reality show.
Former Eastenders actress Charlie Brooks has won I'm A Celebrity ... Get Me Out Here!
Pussycat Doll Ashley Roberts came in second on the show.