Triple H talks about Undertaker being a groomsman at his wedding to Stephanie

“That’s where we always were, so it made the most sense to me to ask there. I pulled him aside and said, ‘We have a wedding coming up, and I’d be honored if you’d be one of my groomsmen.’ The only people I thought of asking were the people I thought of as brothers to me, and the majority of those people are from this business. This is my life, and he’s like a brother to Steph, too. The Undertaker is larger than life, and you can feel that presence in the ring. But there is also the human being, and I’ll always treasure our friendship.”

source: SI