The 8pm results show, in which JLS and Bon Jovi performed and Rachel Adedeji was voted off, pulled in a massive 13.87m (47.8%). Miss Frank's exit on last Sunday's show was the previous high for the series, drawing 13.38m (47.9%).
Elsewhere during the hour, Antiques Roadshow managed 5.72m (19.7%) for BBC One, BBC Two's Ray Mears's Northern Wilderness put in 2.01m (6.9%), and 1.52m (5.2%) watched Celebrity Come Dine With Me on Channel 4.
ITV1's Doc Martin led the 9pm hour, drawing 9.33m (35.1%) with its penultimate episode. Its nearest rival, the first episode of BBC One's Garrow's Law managed 4.46m (16.7%).
Charley Boorman: Sydney To Tokyo By Any Means attracted 1.63m (6.1%) to BBC Two, and 1.01m tuned in for Dreamgirls, starring Beyoncé, Eddie Murphy and Jennifer Hudson, between 9pm and 11.30pm.
Five's film-fest kicked off with Groundhog Day, which drew 977k (3.7%) between 7pm and 9pm. Austin Powers: The Spy Who Shagged Me followed, putting in 930k (4.1%) between 9pm and 11pm.
Overall, ITV1 dominated primetime with an average share of 33.4% to BBC One's 20.6%. BBC Two was third with 7.1%, followed by Channel 4 with 4.6% (+1: 0.8%) and Five's 3.8%.
The Xtra Factor was the most-watched programme on the multichannel stations, drawing an impressive 1.63m (6.5%) during the 9pm hour.
Sky1's screenings of new House and Fringe episodes interested 626k (2.5%) and 462k (2.8%) at 9pm and 10pm respectively.
BARB ratings data supplied by Attentional