Christina slams 'trailer trash' Britney

Raunchy Christina Aguilera has re-ignited the feud between her and Britney Spears, after she labelled the Toxic popstar 'trailer trash'.

The Dirrty singer also criticised her pop rival for buying her own engagement ring — and claimed it looked like something from shopping channel QVC.

"I know Britney. She's not trailer trash, but she sure acts that way," Christina told magazine Us Weekly.

"I can't believe that girl bought her own engagement ring! I've seen it, up close. It looks like she got it on QVC," she added.

Britney is planning a November wedding to whirlwind fiance Kevin Federline, who already has two children from a previous relationship.

The two superstars, who previously starred together as children on TV's Mickey Mouse Club, have previously gone to great lengths to prove there's no bad blood between them — the most recent being the controversial performance with Madonna at last year's Video Music Awards.

But Christina's outspoken comments are sure to fan the flames of rivalry once again.