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When Frances Bean Cobain filed for divorce from Isaiah Silva in March, she explicitly noted in the filing that her estranged husband had no legal right to any of the inheritance she was bequeathed as part of the estate of her late father, Nirvana frontman Kurt Cobain.

That apparently hasn't stopped Isaiah from going after some of the most valuable property from Kurt's estate in the divorce.

According to TMZ, Isaiah wants the Martin 18-DE electric/acoustic guitar Kurt played on MTV's "Unplugged" before his death. He's reportedly claiming Frances gave it to him as a gift when they got married in June of 2014.

"It's not his," Courtney Love told TMZ this week when a pap for the website caught up with her at LAX. "It's a treasured heirloom of the family's," she said, adding that Frances "never planned on" letting Isaiah keep the axe, which was the last guitar her father ever played.

Asked if she believed the court would side with Frances on the issue, Courtney said she did.

"I'm really glad she's out of this very dangerous and toxic relationship," the Hole singer said.

The guitar doesn't just have sentimental value. TMZ reports it was once insured for $1 million and given its ownership history and the fact that the model arrived on the market in 1959 and was discontinued within a year likely means it's worth "several million" dollars today.

The bridge and nut on Kurt's Martin guitar had also been replaced to enhable Kurt, a lefty, to play it upside down, according to the website.

Frances Bean, now 23, reportedly wed Isaiah two years ago in a small ceremony in France attended by about a dozen friends. Her mom was not invited and didn't know about the wedding until Frances called her to fill her in after she said "I do."

"Courtney and Frances have had a strained relationship over the years, but after tons of fallouts they actually get on quite well now," a source told the Mirror last year when news of the wedding surfaced. "Courtney is sad she wasn't there but she totally understands that Frances is her own person and she's happy to let her do her own thing."

Frances has worked as a visual artist in recent years and was credited as an executive producer on the recent documentary about her dad, "Kurt Cobain: Montage of Heck."

Isaiah, 31, is the lead singer and guitarist for the rock band the Eeries.