Kim Kardashian & Mason's Most Precious Moments

She's a natural! See the mom-to-be showing off her maternal instinct with her sweet nephew

01 of 12

OH, BABY!

OH, BABY!
Brian Prahl/Splash News Online

"Khloe, Kendall, Kylie and I are officially aunties," Kim Kardashian wrote excitedly on her blog when sister Kourtney welcomed son Mason Disick on Dec. 14, 2009. Here, the reality star gives her 3½-month-old nephew a lift on an April 2010 family vacation in Miami.

02 of 12

SO HIP

SO HIP
Albert Michael/Startraks

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.

03 of 12

I HEART U

I HEART U
Jake Holly/Startraks

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."

04 of 12

HAPPY FEET

HAPPY FEET
Albert Michael/Startraks

A day before marrying now ex Kris Humphries, Kim takes a break to help Mason, 1½, wash sand from his feet at a pre-wedding dinner on Aug. 19, 2011, in Santa Barbara, Calif.

05 of 12

MATCH MADE

MATCH MADE
Brian Prahl/Splash News Online

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.

06 of 12

MONKEY AROUND

MONKEY AROUND
Ramey

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.

07 of 12

MEET & GREET

MEET & GREET
Albert Michael/Startraks

After quietly dating for months, Kim introduces her little man to her main man Kanye West at sister Kourtney's May 12 baby shower.

08 of 12

ALL IN THE FAMILY

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.

09 of 12

SHADY BUSINESS

SHADY BUSINESS
MAP/Splash News Online

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."

10 of 12

PULLING STRAWS

PULLING STRAWS
Courtesy Kim Kardashian

"Love you Mase," wrote Kim after posting this adorable shot of her and Mason playing around with straws.

11 of 12

LOOKOUT KID

LOOKOUT KID
AKM-GSI

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!

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MOM-TO-BE

MOM-TO-BE
Uri Schanker/Getty

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.

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