Popstar Rita posted a photo to Instagram last night (11 May) after finding out she had topped the Vodafone Big Top 40 charts, meaning her single has been the fastest selling song of the moment on iTunes.
The 23-year-old posed with her back to the camera with a number '1' painted on red across her bare back.
Showing off her designer Calvin Klein underwear, she said: "#iwillneverletyoudown it's because of you!! BOTS!!! Thank you #uvealwaysgotmybackLOL."
Rita also popped in to the radio studios on Sunday afternoon to talk about the single, which was produced and written by boyfriend Calvin Harris.
"It's nice to work together," said Rita. "Honestly, I love working with him. He's such a good soul and he's so easy-going. He's just a proper lad, really down to earth."
Rita's second studio album is due out in September and she teased it will be "named after a love goddess".
Although it's still a working progress, she did open up about her collaboration with Prince, something which she calls a "honour".
"He's just a genius," she said. "He's a one-man kind of guy and he can do it all."
On Saturday (10 May), Rita delivered a raunchy performance at London nightclub G-A-Y, and even though she turned up in a suit, it wasn't long before she stripped down to her Calvin Klein underwear!
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Watch Rita's music video for 'I Will Never Let You Down' below: