Haylie & Hilary Duff at Much Love Animal Rescue Benefit

Haylie and Hilary Duff attended the annual Bow Wow Wow Fundraiser yesterday at The Playboy Mansion. With a $500 donation, you could have mingled on the 6 acre estate and sipped cocktails for a good cause and schmoozed with the celebs at the same time.

The flier for the event was especially cute

More pictures of Haylie and Hilary – keep reading.