Macaulay Culkin Considering Taking Legal Action Against Trace Cyrus Following Brenda Song Insults

Furious Macaulay Culkin has plunged into an ugly verbal attack on his baby mama Brenda Song by her ex-boyfriend Trace Cyrus — and sources say the Home Alone kid is set to unleash a furious legal war and humiliate Billy Ray’s son by forcing him to eat his words.

The 36-year-old rocker went nuclear on the 37-year-old former Disney starlet in an unhinged social media rant June 11 — accusing his former galpal of faking a cancer diagnosis, an abortion, multiple pregnancies, and also stealing thousands of dollars during their seven-year relationship.

Brenda has not hit back yet, but the attack triggered Macaulay — dad of her sons, Dakota, 4, and Carson, 2 — to roar to her rescue.

Now sources tell Globe that he’s set to launch a legal war for his baby mama — who he started dating in 2017.

“Mac is a very easygoing guy and never the type to pick a fight, but when it comes to his fiancée and kids, he’s fiercely protective,” insists a source.

“He’s absolutely sickened by such awful lies about Brenda. He knows not a word of it is true. He’d love to punch his lights out, but knows the best thing to do is slap him with a cease and desist order and force him to retract these vile accusations.”

As Globe has reported, Cyrus is also feuding with dad Billy Ray, 63, publicly accusing the “Achy Breaky Heart” crooner of being “so hungry for fame it’s pathetic” and slamming him as “washed up and delusional.”

Then suddenly, the Metro Station frontman unloaded on Brenda, who’s “been deeply shaken by the whole thing,” says an insider.

“She’s barely sleeping, and terrified Trace will escalate. But Mac’s determined to make sure she feels safe no matter what it takes.”