Chrissy Teigen and John Legend [1] hit up Mariah Carey [2]'s Las Vegas concert on Saturday night, and judging by these photos, they had a whole lot of fun. During Mariah's performance of "Touch My Body," John joined the singer on stage by jumping onto a bed, where one of her dancers quickly blindfolded him. Moments later, Mariah proceeded to tease the new dad by rubbing a giant pink feather on his neck. But that wasn't the best part!

Chrissy was front and center in the audience [3] having a total fangirl moment, screaming, dancing, and cheering on her husband. She later took to Instagram and wrote, "Mariah pulled @johnlegend on stage at her Vegas show and as a lamb, I have never been so happy. There is no Mariah song I don't know the words to and I may have cried but whatever I LOVE YOU @MARIAHCAREY thank you for this amazing night for me and my family!!" That same evening, John posted a photo [4] of him, Chrissy, and Mariah, captioning it, "We go back like babies and pacifiers." Keep reading for a look at the epic moment, then find out how John knew Chrissy was the one [5].