Legendary actor Robert De Niro has been married to his beautiful wife Grace Hightower for 16-years, but the "Last Vegas" star insists he doesn't have the answer on what makes a marriage last.
"There's no secret to a happy marriage! It's a lot of work," said the star at the screening of the HBO documentary "Remembering the Artist Robert De Niro, Sr." at the Sundance Film Festival on Jan. 19.
The 70-year-old, who married Grace in 1997, added, "You have to have a harmony, and [when] some things work, it's very nice."
Grace, 58, also shared her personal approach to life with the film icon: "I would say a lot of give-and-take, standing your ground, because then you keep the respect you started out with."
De Niro, who was previously married to actress Diahnne Abbott from 1976 to 1988, has six children, including a son and a daughter with Hightower.
The couple renewed their vows in 2004 after De Niro received chemotherapy for prostate cancer.
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