On Thursday Hilary tweeted:
Heading to mystery city with moms today! I bet this is when the baby shopping begins! Oh dear... Thank god the hubby's out of town!
Then on Saturday, Haylie tweeted this picture of the three getting ready to go zip-lining:
Me @HilaryDuff and Mama Duff... Ziplining thru San Fran...both of us are in 6 in heels.
