I am pretty sure Lo's is a Marc by Marc Jacobs faridah tote!
you almost got it right, i believe its the smaller version...This is close but I am not sure...it looks like it may be the type of bag that is folded over when carried.
http://www.antoinetteleedesigns.com/stella.htm
oops i should've posted this one! thanks for the heads up! yeah it does come w/the detachable strap!! super cute! i wish it came in black though...I saw she had a strap over her shoulder. That is why I didnt pick that one.
But now after I scrolled thru all the colors I see it comes with detachable strap.
I like it!