The Long Beach, Calif. swimmer tweeted Sunday night that she'd given her backpack to a volunteer at the FINA World Championships in Barcelona, and had forgotten her engagement ring inside the bag.
Hardy's followers retweeted her request 545 times and soon the ring was found.
Hardy's fiancé, fellow swimmer Dominik Meichtry, tweeted this adorable photo of the couple after the ring had been located:
Hardy and Meichtry began dating in 2005 after meeting at the World Championships. The pair got engaged in March 2013 in Malibu, Calif. and will tie the knot in California in October.
Click through the slideshow below to see photos of engaged celebrity couples.