Kim Kardashian & Mason's Most Precious Moments
In between riding trains and hanging with mom Kourtney and dad Scott Disick, a dapper Mason (check out that slicked-down hair!) spends some quality time with his doting aunt Kim at his 1st birthday party on Dec. 12, 2010.
I HEART U
A few weeks later (Dec. 24) at the Kardashian annual holiday party in L.A., Kim steals a balloon-sealed kiss from her youngest family member. "He really loves me; I already know it," Kardashian told PEOPLE in 2010. "I take pictures of him all day and we have a really special bond. I know I'm his favorite aunt."
Très chic! Kim and Mason chill poolside in matching navy nautical get-ups during a family vacation in the Dominican Republic on March 30, 2012.
Kim proves she's more than ready for motherhood by keeping a close eye (and hand!) on her nephew while visiting a Malibu park May 6. "Being a mom is something I've always wanted," shared the reality star.
MEET & GREET
ALL IN THE FAMILY
During a July 8 hospital visit, Kim and Mason beam at the newest addition to the Kardashian clan – Kourtney's daughter Penelope.
On Aug. 8, Kim gives her big sister a much-needed break and takes Mason out for lunch and a little shopping in Calabasas, Calif. "I know Mason is going to be the best big brother in the whole world."
"Love you Mase," wrote Kim after posting this adorable shot of her and Mason playing around with straws.
While heading out to church with his "favorite aunt" in Agoura Hills, Calif., on Aug. 26, Mason keeps an eye out for any bad guys – or paparazzi!
Two and a half months before announcing her big pregnancy news, the reality starlet gets in a little pre-baby practice by taking her cutie-pie nephew to the Miami Children's Museum on Oct. 3.