Matthew Koma revealed that his wife, Hilary Duff, had sex with him while he was wearing the “sweaty” shirt he performed in at Lollapalooza.

Duff, 37, took to Instagram on Monday, August 4, to share a video of Koma, 38, hanging out in a white cutoff tank top, which he paired with a green baseball cap and black shorts.

“Pretty cool that you’re still wearing your shirt that you performed in yesterday at sweaty Lollapalooza and you flew home in, and you’re well into this day,” she quipped. “Also having a pretty intense nip slip right now.”

Koma, who performed at the Chicago music festival with his band Winnetka Bowling League, poked fun at Duff, saying, “You had sex with me in this shirt. What’s that say about you?”

Duff and Koma have offered Us glimpses at the lighthearted relationship moments since they started dating in 2017. After meeting years prior and collaborating together on Duff’s 2015 album, Breathe In. Breathe Out, Koma and Duff got together and tied the knot in 2019.

They expanded their family in 2018 with daughter Banks and in 2021 with daughter Mae. Their third daughter, Townes, arrived in May 2024. (Duff also shares son Luca, 13, with ex-husband Mike Comrie.)

Duff previously told Us Weekly that parenting with Koma brought them “even closer” together.

“We feel happier and more in love than ever,” she gushed in May 2019. “We are looking forward to our long future together. He kind of surprised me and I was like, ‘Yes! Of course! You’re my favorite person in the whole entire world outside of my kids.’”

Since exchanging vows, Duff and Koma have publicly gushed about their relationship.

“I love this moment so much,” Duff wrote via Instagram on their one-year wedding anniversary in December 2020, alongside a photo of her and Koma on their special day. “Matt and I were both too nervous to eat the day of our wedding .. this is directly after …. we slammed a plate of apps someone brought us before taking pictures and this pretty much sums us up … Snacking through life, dreaming about dinner at 7 am and wrangling kids. Oh, and dodging covid the first year of marriage😕. Always with you babe. For you. Over and over I choose you and this ♥️ thank you for being a damn good man.”

Koma praised his connection with Duff in his own sweet social media tribute, writing, “Happy Anniversary Ba … One year ago today looked a whole lot different. I can’t imagine this last year without you to Clorox groceries and avoid the world with.”

He continued: “When I asked you to be my wife, we had no idea our first year would look like this … They always say, ‘The first year is the hardest,’ but in our case it was for completely different reasons and I’m so in awe of your badassery. How you’re able to be the mom, individual, wife, spirit, and tie dye influencer you are, while making it look so easy is mind boggling and I don’t know what I did right to deserve being on the receiving end of it. Thank you for being the most steady, supportive, empathetic, loving, and passionate. You make me so much better. You make our family what it is. You’re the only thing that makes me cry through the Prozac. I love you.”