The intricate design is actually based off of Rihanna's hand tattoo and the handmade ink was infused with lemon, eucalyptus and tea tree oil. Together, these elements give the ink a darker color and a relaxing scent. Shay kept saying she felt like she was in a spa while getting it done and suddenly had the urge to fall asleep!
Watch Shay's video below to see exactly how her epic henna tattoo came to be. Don't forget to click through the gallery above to see other stars' pretty henna designs too. Then tell us in the comments if you have ever gotten one of these temporary tattoos done before!