Kimberly Guilfoyle just had a big birthday party in South Florida. So where was Ivanka?

A grand time was had by all at Kimberly Guilfoyle’s over-the-top 54th birthday held at a private home in Jupiter, Florida, last Thursday night.

[Insert record scratch.]

Not all.

OK, so Guilfoyle’s fiancé, Donald Trump Jr., was front and center to celebrate with his bride to be. The former “Apprentice” costar even gave her a semisweet shout-out on Instagram, calling her “the best broad ever.”

No, Guilfoyle wasn’t lonely. We heard at least 400 people were in attendance, including a few other extended family members, like Lara and Eric Trump, who live in the area, and of course, the former president, Donald J. Trump, was there, apparently with his dancing shoes on.

READ MORE: How Ivanka Trump rang in her 41st birthday in Miami

But two high profile people were conspicuously absent. That would be Jr.’s sister Ivanka and her husband Jared Kushner.

What gives? The former White House advisors have a place (or two) only about an hour south and seem to like to whoop it up on occasion.

A well-connected source told Page Six that the parents of three were indeed invited, but had another commitment.

“They were so sad to miss it,” this person dished. “Their niece’s bat mitzvah was Thursday evening and it had been planned a long time ago.”

OK, that makes sense. We really didn’t want to see any more rumored family conflicts or anything.

Because we remember how the Internet freaked last November, when Trump accidentally edited out the former Fox reporter from half sister Tiffany’s South Florida wedding to billionaire Michael Boulous.

READ MORE: Ivanka’s fun in the sun as she turns 40

After trolls called the move “savage,” among other choice words, Trump eventually posted a fleeting Insta Stories pic of her brother’s gal, complete with happy face emoji.