The 31-year-old model and 38-year-old singer attempted to play the game Toilet Trouble after attending the 2017 Grammy Awards in Los Angeles.
Teigen couldn't help but laugh in a series of Twitter videos as she, Legend and the singer's brother Ron Stephens struggled to assemble the game, which features a miniature toilet that sprays water.
Teigen was still in the sheer black gown that she wore to the Grammys ceremony at the Staples Center. Legend and Cynthia Erivo sang "God Only Knows" at the event as a tribute to performers who died in the past year.
"[I'm performing a tribute] for everybody that we lost this year, which has been a really crazy year," the singer told Entertainment Tonight on the red carpet. "We lost Al Jarreau today. And you know, we lost Prince, we lost George Michael, a lot of really amazing artists."
"I've always looked up to [Prince]," he added. "I've met him a few times, jammed with him a couple times. He's one of the most distinctive and special musicians we've ever seen in pop music. We're all going to miss him."
Teigen and Legend married in 2013, and welcomed their first child, daughter Luna, in April. The model told ET she and Luna will join Legend on his upcoming Darkness and Light tour.
"Oh my God, I much prefer life on the road. I like moving a lot. I like cooking on the bus. I love the bus life," she said before Legend added, "We have a good time. Now Luna gets to join us."