Heather Locklear has lost her battle with sobriety, a source claims — one day after photos of the “Melrose Place” star acting erratically were published by the Post.

The shocking snaps, taken in Malibu, Calif. on Jun. 29, show the 61-year-old — who has a well-documented history of struggles with substance abuse and mental health issues — steadying herself on the ledge of an office building after an undisclosed appointment.

On Wednesday, an anonymous insider told the Daily Mail that Locklear is back on the booze after 20 stints in rehab, saying: “Heather is drinking, The family is very worried. Everyone feels helpless. [Ex-husband] Richie Sambora, her family, especially her daughter Ava who loves her so much.”

The insider also alleged that the mom-of-one has lost a drastic amount of weight after starting to use the injectable diabetes drug, Ozempic.

“Tequila has always been her drink. She can’t stay away from it,” the source added. “She’s also on Ozempic and obsesses over her weight. She’s lost 40lbs.”

The Post has reached out Locklear’s rep for comment.