The Flip or Flop star, 38, who announced her engagement to the Texas realtor, 41, in September after just two months of dating, is "anxious" to beat Anstead down the aisle now that he's hooked up with Renée Zellweger. "She never saw that coming, and it bothers her to no end," dishes the insider.
Haack, who shares son Hudson, 2, with Anstead, 42, and kids Taylor, 11, and Brayden, 6, with ex Tarek El Moussa, is also eager for baby No. 4.
"Josh is a great father figure to her kids, and they’ve been talking about starting a family of their own even before they got engaged," continues the insider.
As much as it’s Haack's style to go all in right away, "a lot of people are convinced she's moving even faster than normal with Josh," the insider adds. "She wants to prove that she’s somehow winning over Ant!"
Haack’s relationship with Hall was confirmed in July, one month after her divorce from Anstead was finalized. Weeks after sparking rumors she and Hall were engaged, the blonde babe confirmed via Instagram her soon-to-be hubby did in fact pop the question.
Meanwhile, news that Anstead began seeing the Judy actress broke just days after the former flames' divorce was all tied up. And while Anstead has yet to propose to the Hollywood star, OK! exclusively learned the lovebirds have been making plans for their future together.
“They’ve been talking about having a small ceremony in England soon, something elegant and tasteful,” an insider previously spilled.
The Christina on the Coast star and Anstead split nine months prior to their divorce being finalized. They were granted joint legal and physical custody of Hudson.