EXCLUSIVE: Luke Wilson is set to join the cast of Nu Image/Millennium Films dramedy “Straight A’s.”

Anna Paquin and Ryan Phillippe were already slotted to star in the pic, as Variety first reported Tuesday.

James Cox is helming from Dave Cole’s script. Riley Thomas Stewart (“The Beaver”) will play Phillippe’s son.

Pic follows a man who’s been in and out of rehab for 10 years (Phillippe) and is haunted by the ghost of his dead mother pressing him to return home to the family he turned his back on years ago. He trots back to Shreveport, only to be faced with his brother’s wife, who’s still pining for him, her first love. Wilson will play Paquin’s husband and Phillippe’s brother.

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Scoot McNairy, John Pierce, Holly Wiersma and Rene Besson are producing. Avi Lerner, Danny Dimbort, Trevor Short, Boaz Davidson, John Thompson, Jamie Adamic and Lati Grobman exec produce.

The casting marks the second actor from the HBO family to join the pic.

Wilson can be seen in the upcoming HBO skein “Enlightened” with Laura Dern, and Paquin currently stars in HBO’s “True Blood.”

He is repped by CAA and Hirsch Wallerstein Hayum Matlof and Fishman.

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