Devon Still -- Ties the Knot in Front of Best Flower Girl EVER!!! (PHOTO/VIDEO)

Houston Texans defensive end Devon Still got married Friday. He was dapper, his bride was beautiful, but his daughter Leah stole the show.

5-year-old Leah was the flower girl, and melted hearts when she toasted her dad and new step-mom Asha. What she said is not as touching as how she said it, so watch.

The shindig went down at the New York City Public Library with 200 guests, including some of Devon's NFL buddies.

Leah has battled cancer ... which seems hopeless a few years ago but she overcame it in spectacular fashion ... she's now in remission.