The episode, which featured David Gest, Sherrie Hewson and Hannah Waterman among its participants, drew an impressive 3.37m (14.3%) for Channel 4 in the 8pm hour, with a further 494k (2.3%) on Channel 4+1.
It beat ITV1's Coastline Cops, seen by 3.09m (13.1%) over the same period, but lost out to Holby City, which had 5.32m (22.6%) for BBC One.
Also at 8pm, The Funny Side Of Christmas appealed to 2.54m (10.8%) on BBC Two, while Five's Nature Shock mustered just 634k (2.7%).
At 9pm, the final episode of BBC One's Tamzin Outhwaite drama Paradox pulled in a below-par 3.11m (13.6%). ITV1's The Bill had 2.99m (13.1%) and Gordon Ramsay's Christmas F Word put in an impressive 2.32m (10.4%) for Channel 4 between 9pm and 10.20pm, with 355k (2.2%) watching on timeshift.
BBC Two's Mock The Week had a slot-leading 3.43m (15%) between 9pm and 9.30pm, then a repeat of the Buzzcocks: Doctor Who Special logged 2.69m (12%), almost as many viewers as its first outing the previous Wednesday.
Five's evening of classic CSI episodes under the title 'Grissom's Greatest' kicked off with 1.1m (4.8%) at 9pm. The audience remained steady at 10pm, with 1.1m (5.8%) watching another episode, then tailed off slightly an hour later to 758k (7%).
Overall, BBC One led primetime with an average share of 21.6% to ITV1's 14%. BBC Two was third with 11.5%, followed by Channel 4 with 9.5% (+1: 1.2%) and Five with 3.5%.
BBC Three's screening of Shrek The Halls was the most-watched multichannel programme of the day, pulling in 1.09m (5%) at 8pm.
Also proving popular was ITV3's repeat of Another Audience With Freddie Starr, which had 792k (3.6%) from 9pm.
BARB ratings data supplied by Attentional