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Kim Kardashian loves being an aunt!

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"I just got done spending time with my nephew Mason!" the reality star, 29, Twittered Thursday.

Kourtney and her on-again boyfriend Scott Disick welcomed back Mason Dash Disick on Dec. 14.

"He's sooo cute, I can't take it!" she posted.

Just days after he was born, Kim blogged that "the whole family is so thrilled, excited and blessed to have Mason in our lives."

She even said that her mom Kris Jenner is starting to enjoy being a grandmother.

"As much as she might say she doesn't like being called one," Kim said, "we know she secretly loves it!!"