Anyone who watched Broadway.com's backstage video blogs with The Addams Family's Jackie Hoffman knows the actress loves a good prank or two. Now that Brooke Shields has joined the cast as the family's matriarch Morticia, the leading lady has also become the victim of Hoffman's hilarious antics. On July 21 Shields stopped by Late Night With Jimmy Fallon where she lovingly dished about her co-star's wild behavior, including some unexpected opening night improv. Shields also discussed her love for the iconic cartoon family, the acting tips she receives from her young daughters and why Morticia makes for one "cool mom." Take a look below!