MILA KUNIS has issued an ultimatum to heartthrob honey ASHTON KUTCHER – ditch DEMI or forget about being a daddy!

Gorgeous Mila, 30, is ready to take the next step in her romance with her former “That ’70s Show” co-star. But she’s getting tired and fed up waiting for Ashton to finalize his divorce from estranged wife Demi Moore.

“Ashton keeps telling her that Demi is the problem,” a friend said. “However, Mila suspects it’s just an excuse to keep the big questions about their relationship and where it’s heading at bay, like getting married and starting a family.

“Ashton talks all the time about how he dreams of having a child with Mila, so she told him to forget about having a kid until Demi’s a memory.”

Ashton, 35, and Demi, 50, separated in November 2011 after six years of marriage. But wrangling over money is preventing a final divorce decree.

Although Demi’s wealthier than Ashton, she reportedly wants spousal support, her legal fees reimbursed and $10 million from a venture fund he established during their union.

“Ashton says he’s not about to let Demi rob him in this divorce,” said another source. “But he’s worth more than $100 million, and Mila knows he would barely feel the pinch.”

According to the friend, Ashton, who grew close to Demi’s three daughters during their marriage, wants to have kids of his own.

“He tells Mila not to worry, they’re going to be married and start a family,” the friend added. “But he’s dragged his heels so much with the divorce she’s not sure she can take him at his word.”