NFL star Rob Gronkowski revealed in his 2015 book, "It's Good to be Gronk," that he hasn't touched "one dime of my signing bonus or NFL contract money." Instead, he's been living off of his endorsement money since his career started in 2010.

On a new episode of UNINTERRUPTED's "Kneading Dough," hosted by Maverick Carter, Gronkowski confirmed that he still saves a full 100 percent of his NFL salary, which has been as high as $4 million in 2017. He's not a big spender, he added: "I'm an easy kind of guy. I can live easy."

But after eight seasons of being careful, the Patriots tight end finally splurged on a big-ticket item. "When I signed my incentive deal last year, my friend had a chain and I was like, 'Dang, man, that's a nice chain.' I never had jewelry in my life. He let me wear it last year at a party and it made me feel good," he told Carter.

"So then, in the back of my head, I said, 'If I hit all my incentives, if I do everything I need to do, get all my bonuses, put all the work in, I've gotta finally treat myself. It's been eight years. I haven't really bought anything in my career, don't really have anything luxury like that.'"