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Haylie Duff, Nick Zano

Faye Sadou

For Napoleon Dynamite actress Haylie Duff, her courtship with boyfriend Nick Zano is no longer all that, well, dynamite.

After three years together, Hilary's older sis and the What I Like About You actor have split up.

"The relationship just ran its course," Haylie's publicist confirms to E! News.

The two met in 2007 while working together on the movie My Sexiest Year. They began dating a year later, according to Life & Style, who first broke the news of the breakup.

Fortunately for Haylie, she'll soon have another man to occupy her time: her sister is expecting a baby boy!

—Reporting by Sharareh Drury