Benji Left This Babe for Paris?!

2/29/2008 1:53 PM PST BY TMZ STAFF
Believe it or not, Good Charlotte backup singer Benji Madden broke off his engagement with Australian hottie Sophie Monk to start a press tour relationship with well-worn heiress, Paris Hilton. Makeup-clad punk poser say wha?!

Looking sad but gorgeous, Sophie was spotted alone in West Hollywood on Thursday. Paris must have an ex or nine she can introduce her to!