If her performance is any indication, and there’s any justice in the world (iffy), the Irish singer-actress is going to be a big, big star.

Remember the name Jessie Buckley.

If her performance in “Wild Rose” is any indication, and there’s any justice in the world (iffy), the Irish singer-actress is going to be a big, big star.

She plays Rose-Lynn Harlan, a single mother from Glasgow who’s just out of prison and dreams of becoming a country star in Nashville.

She’s a wild child. She had her two kids before her 18th birthday, then went to jail on a drug-related charge (long story; she blames the judge for an unfair sentence). Now in her 20s and back home, decked out in cowboy boots and other Western attire, she starts to resume her partying ways. This includes trips to Glasgow’s Grand Ole Opry, a country-music bar where she’s well-known as a local performer.

Her mom (Julie Walters), who took care of the kids while she was gone, has other ideas. Mom wants her to take responsibility for her children and for her own life. She wants Rose-Lynn to settle down, to get a steady job, to spend time with her kids.

But Rose-Lynn loves, loves, country music, and she loves to sing it. Patsy Cline and “Walking After Midnight.” New songs. You name it. She even has a tattoo on her arm with the saying “Three chords and the truth,” which expresses the simplicity and honesty she finds in the music.

It’s not just a phase. She wants to go to Nashville; she knows in her heart she’s meant to pursue her passion. And she could be right: She can sing. Boy, can she sing.