November 03, 2010 09:00 AM

Albert Michael/Startraks

Ribbit!

Kourtney Kardashian carries her little green guy — 10-month-old son Mason Dash — as the pair step out for trick-or-treating Sunday night in the Big Apple.

“Mason had lots of costumes for his first Halloween … Grandma Kris came to New York last week and brought four costumes for Mason with her!” Kardashian blogs.

“I decided to dress up as a pirate. As a child, I always loved how my mom dressed up for every Halloween, so I am going to do the same with Mason!”

Mason is the only child for Kardashian, 31, and boyfriend Scott Disick.

RELATED: Look for Less: Mason Disick’s Cozy Chic

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