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Mason Disick has officially entered the "terrible twos."

The tiny tot looked extremely annoyed as he posed for a pic with mom Kourtney and aunties Kendall and Kylie, while decked out in cowboy gear, at his lavish 2nd birthday party last month.

Kendall Tweeted a pic from the fun-filled festivities on Thursday, with the caption: "masons 2nd birthday! he looks so happy... lol."

The Wild Wild West-themed celebration took place on Dec. 17 at Kris and Bruce Jenner's Calabasas, Calif., mansion, and it was decked out with "haystacks, ponies, goats and pigs. The front yard was literally turned into a petting zoo," a guest told Life & Style Mag.

The guest also added that a pregnant Kourtney and doting dad Scott were "really attentive to Mason. They wanted to make sure he had the best time." Awww!