The 37-year-old tennis star is promoting the I Touch Myself Project, which was launched in 2014 following the death of Divinyls frontwoman Chrissy Amphlett.
Among the traits that connects the Duchess of Sussex to her tennis legend pal: a love of hot sauce, a flair for fashion and what the royal calls "our endless ambition."
After going through harrowing birthing experiences, the superstars have opened up to their fans about the challenges, joys and sacrifices of motherhood