Cardi B and Megan Thee Stallion's WAP is now the UK's best-selling single.
The US hip-hop artistes have become the first-ever female rap collaboration to go to the summit in that territory.
After two weeks at number 2, the track earned 65,000 chart sales, including 8.5 million streams, to take the title.
It's a personal best for both artists.
Cardi's previous peak on the U.K. chart was number 5 for 2018's Finesse, her collab with Bruno Mars.
Megan's previous high point was a number 3 for Savage in May of this year.
WAP is the second female-led single to hit the top this year, following Lady Gaga's Rain On Me featuring Ariana Grande in May.