Pitbull and Kesha hit number one
Pitbull and Kesha claimed the first number one single of the year with new track Timber.
The song fuses rap with country music and is ins pired by Avicii's crossover hit Wake Me Up.
The Official Charts Company said Timber significantly outperformed what is traditionally one of the quietest weeks of the year for singles sales, with over 139,000 copies sold this week.
The news comes a few days after Kesha, 26, announced that she had checked herself into rehab to treat an eating disorder.
Last week's chart topper Pharrell Williams' Happy dropped to number two despite recording sales of 108,000 in the past seven days.
The top five was completed by Avicii's Hey Brother and Jason Derulo's Trumpets - both non-movers at three and four - while Ellie Goulding's Children In Need single, How Long Will I Love You, climbed two places to five.
English singer-songwriter Ellie had more success as she celebrated a second number one album.
Halcyon took 65 weeks to finally reach the chart summit.
Originally released in October 2012, the record features top 40 singles Anything Could Happen, Figure 8, Explosions, How Long Will I Love You and her first ever UK number one, Burn.
Halcyon has sold nearly 665,000 copies in the UK to date.
Robbie Williams' Swings Both Way fell from top spot to number four, while John Newman's Tribute rose 11 places to number five.