While he bet on the San Francisco 49ers, they lost Super Bowl XLVII to the Baltimore Ravens 34-31.
Lopez showed off his chiseled body while his “Extra” co-host Maria Menounos stayed fully clothed in a pink dress and heels.
“Lost my Super Bowl bet on @extratv. Now I have to man up..,” he tweeted. Last year, Menounos lost her Super Bowl bet and had to strip down to a red, white, and blue bikini in Times Square when the New England Patriots lost to the New York Giants.
This is not the first time Lopez has been seen in only his underwear.
Courtney Mazza, Lopez’ new wife, posted a picture of him on her Twitter account back in December, in his red underwear with his butt cheeks showing.
The photo was quickly deleted, but not before it was re-shared on the social site.
Mazza posted the picture of Lopez finishing up Christmas tree decorations with the help of his 2-year-old daughter, Gia, who held his feet, and the caption, “My husband looks hot rockin his @RatedMOfficial with his little elf….#lovethem.”
Earlier this year, Lopez, who has his own underwear line, Rated M, spoke about how fatherhood has changed him.
"It’s made me work that much harder. I’ve always had a strong work ethic and have always been a pretty ambitious guy and a go-getter. Being a father just gives me incentive to grind it out even more.
"It’s the best thing that’s ever happened to me. I’m blessed with a beautiful, healthy little girl. Hopefully there are more to come," Lopez told the Advocate.
Lopez and Mazza got married in Mexico in December, and he later told talk show host Ellen DeGeneres, "Looking back, I wouldn't change a thing. My bride just looked like a little Italian princess."