After three years, it's finally happening!

Kim and Kanye are putting the finishing touches on their $20 million Hidden Hills mansion, after years of renovations, and there's a reason for the rush. Their surrogate is set to give birth to baby #3 around the holidays, Us Weekly reports, and they want to be settled in to their new digs before then.

"The home is done in terms of the renovation but it’s finishing up the smaller things – they don’t want to move in with any construction still happening. Kim’s surrogate is due before Christmas,” a source dished to the mag.

A source tells X17:
    "Kanye has been really particular about every single detail of the renovation, and Kim was patient for a long time, but recently told him she just wants it done so they can move in. She's very organized and gets anxious when things are in disarray, and with the third baby coming, she wants to make sure they're situated. She also wants to get out of their Bel-Air place, because she doesn't feel safe after burglars recently broke into their cars. The Hidden Hills pad has every security measure possible, and that's where she wants to be."

We've caught Kanye hard at work at the studio almost every day for weeks, and now we know why... he's gotta pay the bills on this monster project!