(CNN) Robert De Niro and Grace Hightower have decided to separate after 20 years of marriage, according a report by People magazine.

"Sometimes things don't work out the way you hope or want them to," a source tells the outlet.

The couple married in 1997 and together have two children, Elliott, 20, and 6-year-old, Helen Grace.

The isn't the first time the couple have hit a bump in their marriage. De Niro filed for divorce in 1999, but the two reconciled and later renewed their vows in 2004.

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