The band have thanked fans after topping this week's Official Chart.
Taking to their Twitter account after hearing the news, they wrote: "THANK YOU to every person that has supported #BlackMagic and made it NUMBER 1 in the UK!!! BEYOND happy!! The Girls #BlackMagicNumberOne.
"In case you can't tell... we're pretty happy about being number 1 and the #GetWeirdTour! Thank you Mixers!The Girls."
They added: "Thank you thank you thank you thank you thank you thank you number 1 still can't believe it love you mixers nanite xxjadexx."
It's their first No.1 single since 'Wings' in 2012.
Their first was 'Cannonball' in 2011, their debut after winning The X Factor.
While 'Black Magic' stormed to the top spot, Years & Years' 'Shine' held its position at number two for a second week, while Lost Frequencies are back up to three with 'Are You With Me'.
Thank you thank you thank you thank you thank you thank you number 1 still can't believe it love you mixers nanite xxjadexx— Little Mix (@LittleMix) July 18, 2015
The great news came on the same day Little Mix performed at Thorpe Park Island Beats.
Jade Thirlwall, Jesy Nelson, Perrie Edwards and Leigh-Anne Pinnock matched outfits as usual in white and black.
We especially loved Perrie's white crotchet dress - perfect for a balmy evening.
The former X Factor winners were there to headline Thorpe Park's new music event, which is the second in a string of late-night gigs.
This week, the band also announced a major UK and Ireland arena tour for March 2016.
10 reasons why Little Mix are brilliant role models:
For exclusive competitions and amazing prizes visit Reveal's Facebook page NOW!