Demo recording leaked online

A demo of Britney Spears singing Lady Gaga‘s Telephone has been posted on the internet.

The Bad Romance star – real name Stefani Germanotta – is said to have originally written the track for 28-year-old Britters.

But after recording a rough demo, Britney is thought to have passed on the opportunity of releasing the song.

Producer Rodney Jerkins has confirmed that it is her singing on the leaked version, but has denied that he was the one who posted it online.

It was an early demo stage,’ he tells UStream.

It wasn’t even a mixed version. I would never leak something without Britney‘s approval, without [her manager] Larry Rudolph, without Jive Records.’

Lady Gaga, 24, eventually decided to release Telephone herself as a duet with Beyonce Knowles, 29.

Britney has yet to comment.

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HEAR MUSIC Britney Spears sings Lady Gaga‘s Telephone