"What an amazing year for you," Kylie wrote on Instagram alongside picture of the ladies at lunch

By Karen Mizoguchi
Updated October 27, 2015 10:00 PM
Credit: Courtesy Kylie Jenner

Caitlyn Jenner is celebrating her birthday a little early.

The former Olympian – who turns 66 on Wednesday – kicked off festivities a day early with youngest daughter Kylie Jenner and former stepdaughters Kim and Kourtney Kardashian.

The ladies gathered at The Villa Restaurant in Woodland Hills, California, and were joined by Kourtney’s daughter Penelope, 3, as well as E! camera crews.

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Kylie, 18, snapped a selfie at the family lunch to commemorate the special day. “Early birthday lunch with @caitlynjenner Happy birthday dad what an amazing year for you,” she wrote.

She also took to Instagram to show off the Alexander Wang minidress she wore to the celebration.

Missing from the birthday lunch were Kendall Jenner and Khloé Kardashian.

Khloé, 31, has stuck by husband Lamar Odom‘s bedside after he was found unconscious in a Nevada brothel with drugs in his system. The former NBA player is currently being treated at Cedars-Sinai Medical Center in Los Angeles.

It has been a memorable year for Jenner. Following her much-talked about 20/20 interview with Diane Sawyer in April discussing her decision to transition, she made her debut as Caitlyn on the cover of Vanity Fair‘s July issue, and her first major public appearance at the ESPY Awards.

Jenner’s docuseries I Am Cait was recently picked up for a second season. In addition, she is headed for a multiple-city speaking tour called Up Close and Personal, with the first date schedule on Feb. 22 in Toronto.