The 30-year-old model and "Lip Sync Battle" co-host revealed in the December issue of Cosmopolitan that she and 37-year-old singer nearly split during the early days of their relationship.
"Early on in the relationship, I was on tour with him and he'd gotten sick. He was feeling really bummed and stressed out. He was like, 'I can't be in a relationship right now.' That lasted for one day. Literally, a day," Teigen recalled.
"I knew it came from a place other than us not working," she said. "I always joke, 'Remember when you tried to break up with me?' He's like, 'Yes, sorry. Big mistake.'"
Teigen and Legend met on the set of the singer's music video for "Stereo" in 2007.
Legend previously dated a bevy of models, including Jessica White and Wafah Dufour, but Teigen told Cosmo she isn't bothered by her husband's past.
"I didn't know it, but John used to be a notorious modelizer. To me, he was the sweetest teddy bear," she said.
"What's funny is that I get along with everyone he's ever been with. I end up really liking them. After I see them, I'll tell him, 'Oh, I was on set with your ex today -- it was fun!'" the star revealed. "It was before me, so it's fine."
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Teigen and Legend married in Como, Italy, in 2013, and welcomed their first child, daughter Luna, in April.
The singer said on "The Ellen DeGeneres Show" in October that he and Teigen are already preparing for the infant's terrible twos.
"She smiles a lot," he said of Luna. "She's got a good temperament so far. We're knocking on wood, though, because you never know. They say their twos are terrible and she's only six months, so we'll see."
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