Britney Spears’ sons reportedly held an intervention for the singer before she voluntarily went to rehab for substance abuse.

An insider told the Daily Mail that Spears, 44, was “dragging her feet” about checking into the treatment facility after her March 4 DUI arrest — until Sean Preston, 20, and Jayden James, 19, got involved.

“They’re the only ones she listens to, and they were so loving, so kind, but also so firm,” the source shared.

“This was non-negotiable to them. She needed to get help and they told her that they wouldn’t take no for an answer.”

According to the source, Spears’ boys, whom she shares with ex-husband Kevin Federline, threatened their relationship with the pop star to ensure she went to rehab.

“It was like, ‘Mom, you have to go if you want us coming around,'” the insider said, “and that was all the incentive she needed.”

The source continued, “She wants a relationship with them, which would have been jeopardized if she didn’t go. So she made the right move and they say she seems happy about it.”

Meanwhile, a People source similarly claimed on Monday that Jayden and Sean played “a big part” in getting their mom to rehab.

“They’ve been clear with her. They just want her to be healthy,” the insider said.

In addition, the source stated that Spears is “terrified of going to jail” and finally realized that checking into rehab is her “best option” to avoid landing behind bars.

The “Toxic” singer was taken into custody last month after authorities saw her swerving in and out of lanes.

Cops allegedly discovered an unknown substance inside Spears’ car during her arrest, with the California Highway Patrol previously stating she was believed to have been on a cocktail of alcohol and drugs.

She checked into rehab ahead of her next court date on May 4.

“This was her own choice,” an exclusive source told Page Six.

“This isn’t about one substance in particular, it has a dual purpose…this is about Britney putting her mental health first and taking some time for herself to focus on the things that are important to her.”

The source added, “She’s dedicated to working on her health. This is something she really wants to do for herself.”

Our insider also noted that Spears’ whole family — including her sons— is supportive of the decision.

Sean and Jayden both showed up for their mom after the DUI incident, despite being estranged from her in the past.

The trio even went on a yacht getaway last month.