Ben Affleck, Jennifer Lopez Throw Star-Studded Pre-Christmas Party

Ben Affleck and Jennifer Lopez threw a massive Hollywood party at their Los Angeles home a week before Christmas and invited A-list personalities, including Billie Eilish, Doja Cat, Eric André, Kim Kardashian, and many more.

The newlyweds, who first tied the knot at a surprise wedding in Las Vegas in July, hosted a pre-Christmas party and decorated their home with a festive light display, Entertainment Tonight reported.

Aside from the decorations, the party was filled with almost everyone's favorite party snacks, such as pizza and booze. The couple prepared a pizza station, an outdoor bar and a gingerbread house replica of their mansion. There was also a hot chocolate station for guests to warm up with a sweet treat, the outlet noted.

But to kick off the holiday bash, the 53-year-old "Dinero" singer performed her soulful rendition of "By Christmas Eve," originally sung by John Legend, with Steve Mackey at the piano.

Surprisingly, the 50-year-old "Argo" director joined in on his wife's song number and received huge cheers and support from the partygoers. Lopez reportedly wrapped her arms around Affleck and planted a kiss on his cheek right after their performance.

Affleck and Lopez have been enjoying their Christmas preparations in the past few weeks, according to an unnamed source that spoke to ET.

"Jen's favorite holiday is Christmas, so she always goes all out, but this is a really exciting time for them as a couple since it's their first Christmas as husband and wife," the source said. "Ben and Jen picked out and decorated a huge tree with the help of their children. Their home feels festive and looks gorgeous with decorations and everything lit up."

The source added that the "Marry Me" star wanted "this year to be even more special than usual and to make new traditions of their own, both as a family and with Ben."

The pair would be celebrating their first Christmas together as a married couple along with their five children — Lopez's 14-year-old twins Max and Emme, whom she shares with ex-husband Marc Anthony, and Affleck's children with ex Jennifer Garner, 17-year-old Violet, 13-year-old Seraphina and 10-year-old Samuel.

"They are planning to spend the holidays together with the kids and Jen's family. Jen, her mom, and her sister are all amazing cooks, so they're looking forward to being with each other and eating amazing food," the source added.

As for presents, the "Jenny From The Block" singer has reportedly "picked out some things for Ben" in an effort to spoil him for the holidays, while the "Gone Girl" actor plans to gift Lopez with "special and sentimental" things such as jewelry and is preparing "big things that are surprises."

Earlier this month, the couple was spotted on a Christmas tree hunt in Santa Monica, California. During the sighting, all of their kids from previous marriages were present, TMZ reported.

The blended family opted for a huge balsam fir, which was tied on top of their SUV, before heading back home, as seen in photos obtained by the tabloid.

Affleck and Lopez rekindled their romance about 20 years after they first got engaged in 2003. The couple officially got married at an intimate ceremony at the Little White Wedding Chapel on July 16. But they tied the knot again in Affleck's 87-acre Georgia estate before their family and close friends in August.