Entertainment Music Jennifer Lopez and Jenifer Lewis Sing Together at Her and Ben Affleck’s Holiday Party: ‘So Much Love in the Room' The two sang "Have Yourself a Merry Little Christmas" during the gathering By Charna Flam Charna Flam Charna Flam is a writer-reporter at PEOPLE. She has been working at PEOPLE since 2023. Her work has previously appeared on Variety, The New York Post, and The Wrap. People Editorial Guidelines Published on December 19, 2023 01:03AM EST Close Jennifer Lopez and Jenifer Lewis. Photo: Gilbert Flores/WWD via Getty; Santiago Felipe/Getty Jennifer Lopez treated her holiday party guests with a sweet serenade. On Saturday night, the Grammy winner, 54, was joined by party guest Jenifer Lewis for a special rendition of “Have Yourself a Merry Little Christmas.” Lopez and her husband, Ben Affleck, threw a star-studded Christmas bash at their home in Los Angeles, with Lewis, 66, Margot Robbie, Michael B. Jordan and Lily Rabe among the many guests in attendance. During the celebration, the Black-ish actress sang the Christmas classic alongside the Hustlers star. "There was so much love in the room," Lewis wrote on X (formerly known as Twitter) after a video of the performance circulated. "Great party baby girl♥️♥️♥️ Happy Holidays Everybody♥️." Jenifer Lewis in West Hollywood on April 27, 2022. PATRICK T. FALLON/AFP via Getty In the video, the two are seen embracing behind a grand piano and a smaller keyboard. Lopez kept her arms wrapped around the Sister Act actress as the two sang together. Celebs Are Decking Their Halls! How Jessica Simpson, Jennifer Lopez and More Decorate for Christmas at Home Jennifer Lopez on December 05, 2023 in Los Angeles, California. Kevin Winter/Getty “They threw a really fun party,” a source told PEOPLE on Sunday. The insider shared that Lopez led the partygoers into singing Christmas carols late into the night. While Lopez and Affleck were meeting with friends separately while also hosting, the source went on to say, “They were both in such good spirits." The house was decorated in holiday decor with a huge Christmas tree at the entrance. "The kids were all there dancing and having a great time, especially the twins and Violet," adds the source of Maximilian "Max" David Muniz and Emme Maribel Muniz, 15, and Affleck's daughter with Jennifer Garner, Violet Anne, 18. Garner, 51, and Affleck, 51, also share Seraphina Rose, 14, and Samuel, 11. Lopez shares her twins with ex-husband Marc Anthony. This is Affleck and Lopez's second holiday season together after marrying in 2022. They were engaged in 2003 and 2004, and reconnected romantically in 2021. Jennifer Lopez Says She and Ben Affleck Are 'Real Partners': He Wants to 'See Me Shine as Bright as I Can' Ben Affleck and Jennifer Lopez. Steve Granitz/FilmMagic Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human-interest stories. Before their party, the Maid in Manhattan star showed herself getting in the Christmas spirit as she unveiled her Christmas tree at her Beverly Hills home shared with Affleck on Instagram. The “On The Floor” singer posted a photo of herself posing in front of a towering evergreen tree decorated with golden baubles and pine cones. Jennifer Lopez poses for her holiday Instagram post. JLo/ Instagram Lopez matched the color scheme of her Christmas tree as she wore a high-waisted skirt with golden embroidery, paired with a gold bracelet, an embellished belt, and sparkly gold platform heels.