Haylie Duff And Her Mystery Man

10/8/2007 1:10 PM PDT

Haylie Duff and her Mystery Man

Hilary Duff's sister was spotted in Malibu over the weekend, sporting a new accessory. A man!

The older Duff was arm-in-arm with a scruffy new chap.

Just who is this mystery man?

UPDATE: Mystery solved! A couple of astute TMZ readers identified Haylie's man as Charlie McDowell, son of Mary Steenburgen and former husband Malcolm McDowell.