Chrissy Teigen Explains the John Legend Naked Butt Pic: We Had a Few Glasses of Wine!

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Lip Sync Battle commentator Chrissy Teigen explained to ET what led to her John Legend butt post. Hint: It involved "a few glasses of wine."

NSFW VIDEO: Chrissy Teigen Posts Naked Picture of John Legend Because She Can

"I had been posting my own pictures and getting in trouble for them for that entire week, and then I realized butts are OK, so you're going to get a butt now," Chrissy said referencing her exposed nipple shots that were removed from Instagram, per their guidelines. "Not my butt, though, because I don't have one."

Last week, Chrissy posted a shot of her husband's bare backside with his consent.

"I thought I was being pretty modest with it," Chrissy said. "It was maybe midnight. We had a few glasses of wine. Yeah, that morning we definitely got a lot of comments about it."

NSFW: Justin Bieber Bares His Butt on Instagram

Everyone seemed to have a strong opinion about the post except for the subject himself.

"He didn't mind at all!" Chrissy said. "Everyone's like, 'I can't believe he would let you' or, 'I can't believe you would do that to him! How rude!' I'm like, 'Do you not think he had full approval over that shot?' He didn't mind it. Trust me."

WATCH: NSFW! Chrissy Teigen Goes Topless for 'W,' Fights With Instagram to Post It

Chrissy spoke to ET before the live Lip Sync Battle concert in New York City's Central Park on Monday. Julianne and Derek Hough are expected to perform for the non-televised live show, as well as Broad City stars Ilana Glazer and Abbi Jacobson.

Lip Sync Battle, hosted by LL Cool J, airs Thursdays at 10 p.m. ET/PT on Spike TV.