Collin Gosselin wants to put his mom, Kate Gosselin, to the ultimate test with a polygraph.

The “Jon & Kate Plus 8” alum took to his Instagram Stories on Thursday to invite Kate to take mother-son lie detector tests amid news she’s dating the famous family’s ex-bodyguard , Steve Neild. “This is my formal invitation to do a lie detector test with my mom lolll,” Collin, 21, wrote, alongside a laughing emoji.

“Then we’ll see who’s been lying straight to the public… I’m so serious by the way,” he added alongside a second laughing emoji.

Reps for Kate and Collin did not immediately return Page Six’s requests for comment.

The challenge comes a day after Collin and his father, Jon, 48, reacted to news that Kate, 50, is involved with — and living with — Neild following years of affair ru

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