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Jon Gosselin away with gal pal while Kate had B-day boo hoo with octos.

On the latest installment of JK8 filmed in March Kate has 34th birthday party solo without Jon.

Where was Daddy Dearest?

"I went out to Utah for, like, five days," he said to the camera. "I just wanted to get back out there and ride with my friends. It just happened to fall on Kate’s birthday."

Not shown on camera, a source confirmed,  Deanna Hummel, 23, one of Jon’s gal pals, he was off riding with.

Meanwhile the Pennsylvania Department of Labor investigation continues to determine if JK8 violates child labor laws after receiving a written complaint.