Caitlyn Jenner -- I Get It Now ... Changes Tune on Gay Marriage

More change for Caitlyn Jenner -- her controversial opinion on same sex marriage has evolved ... dramatically.

Jenner wrote on her blog ... "After hearing from my gay friends and learning more about the hardships they faced because of discrimination, it became clear to me that everyone should be able to marry the person they love."

Caitlyn most likely heard from her gay friends when her appearance on "Ellen" aired last week. On the show, she admitted she was a traditionalist and had opposed gay marriage ... but was now just "ok with it." It was stunning, considering her own crusade for acceptance.

The backlash was immediate, and, apparently, impactful.