A real rhyme after all

Rico says he had to look it up, but it seems the 'soft kitty' rhyme used in The Big Bang Theory is real:

According to Matty Angel, it was originally published in Songs for the Nursery by Laura Pendelton MacCarteney (no, not that McCartney) in 1937; the tune was written by Edith Newlin.

Rico says he discovered there's a whole slew of variously-clothed pictures of Penny, played by Kaley Cuoco (photo), here... (Self-abuse while viewing them is, however, quite understandable.)