Moore, 50, had been married to Kutcher, 35, for six years when they split in 2011, after which she struggled though a public meltdown and checked briefly into rehab.
Kutcher filed his own papers in December, and has been dating Mila Kunis for almost a year.
Kutcher's relationship with Kunis, along with difficult, even hostile negotiations over the money he has made as the highest-paid actor on television, prevented the two parties from coming to a settlement.
“After over a year of attempting to reach a settlement, Demi is definitely ready to move on,” a source told Page Six. “It’s hoped lawyers for both sides can reach a settlement this spring, otherwise the divorce will go into litigation and trial.”