Hailey, the daughter of the plastic surgeon who performed Kate's tummy tuck after she gave birth to her sextuplets, had a scandalous affair with Jon just weeks after he split from Kate.
But it seems that all is forgiven, and the two women are tweeting about cooking advice.
"Hey @kateplysmy8 can you share the recipe for the "Monkey Munch," Hailey wrote to Kate. "It's so yummy, my mom & I never seem to make it as tasty as you did."
And shockingly the former Kate Plus 8 star was quick to issue a friendly response.
"@hAiLeYgLaSsMaN1 go to the chex website...It should be there..not my recipe but love it! Called 'muddy buddies' there! Enjoy! :)"
Incredibly -- well, we are talking about reality stars here -- the friendly Kate-Hailey tweets come just days after RadarOnline.com reported that Kate and Jon were in a Twitter war!
Three years ago, Hailey's affair with Jon was as tumultuous as the Gosselin's marriage.
He falsely accused her of ransacking his NY apartment and she claimed he borrowed $200,000 from her and refused to pay it back. The pair's romance ended just one year after it began.
We can't wait to see how long kate and Hailey Twit-romance lasts.