So, the question I have is about introducing my gf to the kids. We've been together a year+, and the kids know about her, so it's not a surprise.

There is no language in my agreement about meeting new partners, but my ex will surely be pissy about it. My question is, do i need to even announce to my ex that the kids will be meeting her, or just arrange it and go on with my life?

Bonus points for suggestions how to arrange the meet. (First time doing this, so not sure the best plan)