The triumph of Britney Spears' new single with Elton John made for "the happiest day ever," in

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her words. The song "Hold Me Closer," a collaboration between Spears, 40, and John, 75, was released

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on Friday. According to Spears, it became an instant hit and peaked at No. 1 on the iTunes charts

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in the US and numerous other nations. She posted an impromptu video on Twitter in response to the

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song's success, addressing John in her best British accent. We are like No. 1 in 40 countries, hello Sir Elton John,

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" she begins before shouting, "Holy s—! I hope all is good with you as I get ready to have the best

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day ever while I'm in the tub. Regarding Spears' video, John said: "Britney, hello! I'm appreciative

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of this communication. You brightened my day! Enjoy your day dancing to our music, everyone! #HoldMeCloser."

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Along with a song clip, he tweeted in response to the song's popularity. "The reception to #HoldMeCloser has me

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ecstatic. I was thrilled when @britneyspears agreed to take part in it because I wanted to make a lighthearted.

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