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But that was then.
"I made a resolution [that] in 2016, I was not going to mess with Matt Lauer anymore," she told her audience on Tuesday's show. "Instead I'll just show you this clip of him interviewing Adele."
Despite that innocent intro, Ellen was back to her old tricks — specifically the digital trickery that makes it look as if Matt has suddenly gotten a bit hands-on in an interview. Or in this case, encouraged Adele to get hands-on.
Of course, that wasn't exactly how his real conversation with Adele went.
So the prank war is back on, but will Matt return fire?
"I have no idea," Matt said with a smile after watching the latest gag. "I'm going back to billboards, apparently. I've got to figure something out."
We'll just have to wait and (hopefully) see!
Follow Ree Hines on Twitter.