Kendall and Kylie Jenner spend time with nephew Reign

LOS ANGELES, Dec. 14 (UPI) -- Kendall Jenner and sister Kylie Jenner spent quality time with nephew Reign over the weekend.

The 20-year-old model and 18-year-old reality star shared adorable new photos with the 1-year-old on Instagram. Reign Aston Disick is the youngest child of the Jenners' half-sister, Kourtney Kardashian, and her ex-partner, Scott Disick.

"Me as a mom," Kendall captioned a picture of herself with Reign, garnering over 2 million likes. Kylie shared a short clip of herself and Kendall in matching coats, writing, "The cool aunts."

Kendall and Kylie are also aunts to 6-year-old Mason Disick, 3-year-old Penelope Disick and Kim Kardashian's children, 2-year-old North West and newborn Saint West. Kendall was mobbed by reporters asking about Saint upon her return to Los Angeles last week.

Kendall Jenner with nephew Reign Disick on Dec. 12. Photo by Kendall Jenner/Instagram

Kourtney and Scott were together nine years before splitting in July, and sparked reconciliation rumors by reuniting over Thanksgiving. The 36-year-old mom-of-three was linked to 21-year-old singer and family friend Justin Bieber over the weekend.