Abby Wambach is officially off the market ... TMZ has learned the Team USA soccer superstar got hitched to her longtime girlfriend this weekend at a fancy resort in Hawaii.
Multiple sources confirm ... Abby and pro soccer player Sarah Huffman swapped "I dos" on Saturday at the Villas at Po'ipu Kai on the island of Kauai.
We're told the ceremony went down at sunset ... right on the beach ... in front of the couple's closest friends and family members.
Sources say it was a very intimate gathering -- attended by several members of the Team USA soccer team, including Alex Morgan and Sydney Leroux (see below).
The couple -- and their guests -- spent the past few days doing all sorts of fun activities, including hikes, cliff diving and even a boat trip.