Britney Spears has reportedly sold her music catalogue to publishing firm Primary Wave

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 name and likeness (NIL) rights unless the figure was far more than TMZ had estimated.

The 44-year-old singer is said to be happy with the sale and has been celebrating by spending time with her sons.