They're the first Russian act ever to have a UK number one.
And the charts themselves made the news on Sunday when new presenter Wes Butters kick-started the re-vamped Top 40.
Wes, 23, introduced the new show which now includes live performances and more focus on the album charts. Chart-toppers Liberty X joined Wes for his first show.
N'Sync star Justin Timberlake was Tatu's nearest rival, but he went in at number two with his second solo track, Cry Me A River, believed to be a dig at his ex, Britney Spears.
There were loads of other new entries in the top 10 too.