KENDALL JENNER CELEBRATES 18TH BIRTHDAY AT MASQUERADE DINNER PARTY WITH KIM KARDASHIAN

Five days after a birthday takeover of Six Flags Magic Mountain with her famous family, Kendall Jenner celebrated officially turning 18 at a smaller but still fun masquerade dinner party, presumably in the L.A. area, with loved ones including sisters Kim Kardashian, Khloe Kardashian, and Kylie Jenner.

Khloe, Kylie, Kendall, and mom Kris Jenner shared pictures from the happy occasion via Instagram on Sunday, Nov. 3. In one photo, the birthday girl rocks a red-and-gold glittery mask and poses with pal Spencer Johnson, who has on a leopard print cat mask with black trim and colored jewels.

Khloe, 29, also donned a bejeweled cat mask for the bash. She paired hers -- all black except for some colored beads -- with a black-and-white plaid jacket, a black tank top, and slim black pants. "Birthday girl," she captioned a photo of her and Kendall at the restaurant. Later, she added a pic of her 18-year-old sister blowing out the candles on an elaborate rose-topped birthday cake.

Kim, 33 -- who has a lot to celebrate herself, what with her recent engagement to Kanye West and their 4-month-old daughter North -- declined to share any snapshots from the celebration, but Kardashian matriarch Kris Jenner caught her on camera and shared the photographic proof via Instagram.

One thing Kim did share?Her sweet birthday message to Kendall. "Happy 18th Birthday to the sweetest girl I know," she tweeted on Nov. 3. "I hope your adult years are filled with happiness & so much [love]."