Yahoo, by Kimberly Potts
https://www.yahoo.com/tv/laverne-shi...695390055.html
[From an article about the 25 things you never knew about Laverne and Shirley]
18. Shirley Feeney’s beloved Boo Boo Kitty became an inanimate series regular when Williams pulled the stuffed animal prop out from under a bed during rehearsal one day. Laverne and Shirley were spring cleaning, and while Shirley was supposed to find dust bunnies under the bed, she found a black, stuffed animal cat, instead. She improvised and called it Boo Boo Kitty, in honor of one of her mom’s real cats. Because there was only one of the props — the propmaster couldn’t find a duplicate — it had to be locked up after every show for safekeeping, but Williams writes in Shirley, I Jest! that, years later, the propmaster gave Boo Boo Kitty to her.
The toy cat also had its own celebrity fan. Williams writes that when she met Stevie Nicks backstage at a Bruce Springsteen concert, Nicks greeted her with, “Oh, hi! It’s you. I love Boo Boo Kitty!”