Jennifer Lopez and Leonardo DiCaprio are apparently "Boo Boo" and "Baby" to each other. That's one revelation to come out of "The Late Late Show" host James Corden's new "Carpool Karaoke" segment with JLo. The host and his guest basically pranked Leo during the segment, with James sending the Oscar winner a ridiculous fake text from JLo's phone, then the pair poked fun at Leo's serious(ly hilarious) response.

The entire 13-minute video is a fun watch, including Jennifer's insistence that she did not insure her butt for a million dollars, 'cause that's not even a thing in this country. But the best part is when she breaks out her phone and James asks her to name the most famous person in there. That happens around the 9:50 mark, where she notes she's friends with Demi Lovato, Chris Brown, Bradley Cooper, Cristiano Ronaldo, Dwayne "The Rock" Johnson, Fergie, etc.

James declared it "the best phone I've ever seen in my life." He asked if he could text one person, and decided it should be Leonardo DiCaprio.

Ultimately, this is what he texted to Leo: "Hey, baby, I'm kind of feeling like I need to cut loose. Any suggestions? Let me know. J. Lo (you know, from the block)."

Is that not the dumbest text ever? Jennifer was embarrassed, saying, "I'm going to have to explain this" to Leo. But apparently not!

Later on, Leo wrote back: "You mean tonight, Boo Boo, club-wise?"

Tonight, Boo Boo, club-wise! Both James and Jennifer got a kick out of that. "Here's the funny part, that he actually thinks I'm serious," Jennifer said, laughing at the idea that Leo believed she would even write that and add "J.Lo." James told the "American Idol" judge it sounded like she was going out that night, but JLo said she was just going to go home and cook with her kids. Boo Boo's club nights are over.

Watch it all:

For all we know, the reply wasn't even from Leo. Maybe Conan O'Brien borrowed his phone for his own joke text.

And if you still want more hilarious Leo in your life, checking out the new Honest Trailer for "The Revenant":

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