Paris Hilton has rejected rumours she has had breast implants to make her chest look fuller.

The hotel heiress - who once flaunted her petite A-cups on the cover of U.S. magazine Vanity Fair - sparked rumours she has had breast implants after she was recently photographed with a noticeably bigger chest.

But a spokesperson for Hilton insists she hasn't had her breasts surgically altered, crediting "a prototype from her Paris Hilton 'push-up' bra line" for the star's enlarged cleavage.

The representative adds: "Paris has never had plastic surgery."

But does Paris really need to look more fake?