Petite and playful, the Jeffrey Campbell Sweet-On-U Kitten Heels will steal your heart with its easy slip-on style, square toe, and beloved bow accent. Petite and playful, the Jeffrey Campbell Sweet-On-U Kitten Heels will steal your heart with its easy slip-on style, square toe, and beloved bow accent. Since 2000, Campbell and his wife Christina have created footwear that’s at once accessible, comfortable, and fashion-forward, delighting their fans with a constant stream of new styles that reflect an uncanny ability to anticipate upcoming fashion trends.