United Kingdom, Feb. 11 -- Britney Spears has sold her music catalogue.

The Toxic hitmaker has agreed what has been described as a "landmark deal" with publishers Primary Wave for "her ownership share" of her songs including the likes of ... Baby One More Time, Gimme More, I'm a Slave 4 U, Lucky, Sometimes and Stronger.

According to legal documents obtained by TMZ, Britney agreed the deal on 30 December, and while they didn't state how much she had sold her catalogue for, sources told the outlet it was in the same league as the $200 million agreement Justin Bieber made when he sold his music.

It is likely Britney's artist royalties and publishing rights were included in the deal but Variety suggested it probably did not include her nam...