ASHTON KUTCHER has secretly proposed  MILA KUNIS, sources say, but she won’t say “yes” UNTIL he divorces Demi Moore!

“Mila loves Ashton, and he checks all the right boxes for her,” a friend of the 29-year-old actress told The ENQUIRER.

“He’s handsome, considerate, gets along great with her family, and she trusts him implicitly. But Ashton has some issues, and he needs to work toward clearing them up before she can even think about marriage.”

For “Black Swan” beauty Mila, the biggest issue is 34-year-old Ashton’s marriage to Demi, 49, insiders say. The pair wed in 2005 and split last November amid reports that the “Two and a Half Men” star had been unfaithful.

Demi fell apart after the breakup, and Ashton considered filing for divorce while she was in rehab last February, said another source. “But in the end, he just couldn’t do that to her,” the source explained. “He’s been waiting for Demi to make the first move out of respect for her. In fact, he’s low-keyed his romance with Mila for the same reason.”

Ashton and Mila met in 1998 when they were cast as high school sweethearts on “That ’70s Show.” The pair starred on the hit series for eight years and stayed close throughout his marriage to Demi, and Mila’s eight-year relationship with actor Macaulay Culkin.

Since they started dating six months ago, they’ve vacationed together in Bali, caught an L.A. Dodgers game with Mila’s parents and were recently spotted sneaking kisses in New York’s Central Park.

“This is no whirlwind romance for Ashton,” said the source. “He loves Mila and wants to marry her, but she’s begged him not to expect an immediate answer to his proposal.

“It’s up to Demi to finalize things now.”