Meghan Trainor, James Corden are "All About That Change"

Meghan Trainor performs during a taping of "The Tonight Show Starring Jimmy Fallon" at Rockefeller Center on May 21, 2015, in New York City.

Theo Wargo/NBC/Getty Images

Meghan Trainor and James Corden want everyone to know their plan for the New Year.

The singer appeared on the "Late Late Show" and created a music video with the host, set to the tune of "All About that Bass," but this time, they talked about their New Year's goals, which included working out. The adorable pair wore matching outfits with pink bows on their heads.

"Yeah it's pretty clear, I ain't no size 2," sang Corden. "But I just joined a gym like I'm supposed to do.

"Cause I got that boom boom, I'm walking up the staircase, and all the wrong junk in all the wrong places."

Trainor sang about her vices afterward.

"After work, I come home and I have a glass of wine, and when I say a glass, I really mean four or five," she said.

The two sang that they've resolved to drink more water and stop drunk-dialing their exes. The chorus of their song goes, "I'm all about that change, 'bout that change this year."

It turns out, though, that they may not be so sincere. Trainor claims she's been doing great with her goals so far, and then sings, "Ah just playin' -- I went out last night," and the two confess, "We're not about that change; we're quitting."

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