Gisele -- Hottest Retirement Party ... Ever! (PHOTOS)

Sad day for the fashion world, and an even sadder one for the guys-ogling-hot-chicks world -- Gisele Bundchen has walked her final runway ... at 34.

The modeling legend -- whose career earnings are reportedly near $400 million -- hit the catwalk for Colcci during São Paulo Fashion Week in her native Brazil. She's gonna keep working in the modeling biz, but says she's done strutting for pay.

Hubby Tom Brady, her parents and sister all sat front row for the show. Tom posted a disgustingly drippy love letter to his missus about her accomplishments and inspiration, and blah blah ... but best of all he ends it with, "I can't wait to see what's next. I love you. ?#‎GOAT?"

As long as we remember her in our hearts, she'll never really be gone. Plus, there's still old Victoria's Secret catalogs.