Kris Jenner joined other family members at a dinner for estranged husband Bruce Jenner's 64th birthday Credit: Courtesy of Kris Jenner

Kris Jenner's split from estranged husband Bruce Jenner isn't just civil -- it's downright chummy. On Sunday, Oct. 27, a little less than three weeks after the couple announced the end of their 22-year marriage, they enjoyed a celebratory family dinner in honor of Bruce's 64th birthday on Oct. 28.

"Just another family Sunday night dinner!!" Kris captioned an Instagram photo of herself with daughter Khloe Kardashian, Bruce's son Brandon Jenner (from his marriage to Linda Thompson), and Brandon's wife Leah. All four were decked out in festive party gear -- for example, fake mustaches and tiny gold-glitter hats.

Khloe shared a few snapshots from the happy occasion, too. "Such a fun early Birthday dinner for my Brucey," she tweeted to her 8.5 million followers. "I am so lucky!!! I was blessed with TWO phenomenal fathers!!! Family first."

"He deserves not one but TWO cakes," she added, along with a side-by-side shot of two elaborately decorated desserts, one in the shape of a giant golfball, and one in the shape of a helicopter. "A few of his favorite things."

Bruce himself didn't appear in any of the photos, but it looks like the celebration was a lively one. Khloe also shared a few pictures of herself and younger sister Kendall Jenner goofing around with the tiny hats and stick-on mustaches. "Silly sisters," she captioned the collage.

Ironically, the Kardashian-Jenner clan seems closer than ever since Kris and Bruce went public with their separation in early October. "We ended a marriage, but that's not the end of our friendship," the 57-year-old talk show host told Us Weekly exclusively at the time. "I will always love him, but we are no longer a couple in that way."

Added Bruce: "We will always love and respect each other and be part of each other's lives."

Indeed, the estranged spouses are still very much connected. "We still do things together and talk three times a day," Kris explained. "It's a modern-day situation."