The music industry awards ceremony, hosted by James Corden, averaged 4.75m (18.4%) for ITV1 between 8pm and 10pm, while a further 167k (0.7%) tuned in on ITV1 +1.
The Brit Awards audience fell off sharply in the 9pm hour, as Big Fat Gypsy Weddings captivated 6.45m (23.8%) on Channel 4. A further 946k (5.1%) watched the programme an hour later, the biggest multichannel audience of the night.
The Cutting Edge series - which has been criticised by the Irish traveller community - also eclipsed Outcasts in the 9pm hour, after the BBC One sci-fi drama tumbled to 2.63m (10%), a fall of 700k week-on-week.
Earlier, The One Show entertained 4.74m (20.8%) on BBC One from 7pm, while Grimefighters had 2.53m (10.5%) on ITV1 from 7.30pm and 76k (0.3%) on +1. Holby City pulled in 5.59m (22.2%) on BBC One in the 8pm hour.
Over at BBC Two, Natural World captivated 1.78m (7.6%) from 7pm, before A Farmer's Life For Me entertained 1.55m (6.2%). The Chinese Are Coming grabbed 1.47m (5.6%) in the 9pm hour and Charlie Brooker's How TV Ruined Your Life amused 1.1m (5.3%) from 10pm.
Channel 4's Coach Trip continued with 1.8m (10.6%) from 5.30pm and 297k (1.4%) on +1. Later, Gok's Clothes Roadshow had 1.83m (7.3%) in the 8pm hour and 143k (0.5%) an hour later. Shameless rounded out the evening with 2.28m (12.9%) from 10pm and 220k (2.5%) on timeshift.
Extraordinary Dogs mustered 737k (3.1%) on Channel 5 from 7.30pm, before documentary Stanstead: The Inside Story fetched 1.26m (5%). CSI and CSI: Miami brought in 2.06m (7.9%) and 1.26m (6.8%) respectively from 9pm.
Overall, BBC One owned primetime with 19.6% against ITV1's 17.4%. Channel 4 came in third with 12.5%, ahead of BBC Two with 6.2% (+1: 1.5%) and Channel 5 with 5.4%.
BARB ratings data supplied by Attentional