Britney Spears' erratic behaviour at a magazine photo shoot this week could leave her facing a £10k bill.Not only is Britney, 25, reported to have behaved oddly and made a mess of her make-up, she's alleged to have left the studio with designer dresses and jewellery.It's claimed the mum-of-two went home with a £472 Vera Wang dress, 2 diamond rings worth £6,192, a £145 Mia Vita dress, £184 Lanvin heels, a £136 Pucci headscarf and a £42 gold bangle.It's also alleged that Britney - who left the shoot before it was over – damaged a £2,715 Versace gown, £288 Marni heels, and a £132 Alisha Levine dress.Her new puppy is said to have relieved itself on a £3,248 Zac Posen gown, reports the Daily Mirror.'We can confirm Britney left the interview wearing the above items and acted in the ways stated above,' confirmed US OK! mag.Britney's people were unavailable for comment.