WNBA champ Elena Delle Donne is riding off into the sunset -- she just announced her retirement after 10 seasons. The 6'5" hooper -- who played for the Chicago Sky and Washington Mystics during her career in the W -- released a statement on her decision ... revealing it's something she…

WNBA superstar Elena Delle Donne -- the reigning MVP of the league -- has come out publicly for the first time ... revealing in a piece for Vogue magazine she's engaged to a woman. E.D.D. had never addressed her sexuality in public before ... but in the Vogue piece acknowledges her fiancee Amanda…