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Little Mason Disick is growing up fast!

The adorable "Keeping Up with the Kardashians" star celebrated his third birthday over the weekend -- and the bash was attended by his famous family members.

Mom Kourtney, dad Scott and baby sister Penelope were on hand for the event, which was held Saturday night at Serendipity 3 in Miami.

Kourtney's sisters Khloe and Kim Kardashian were also in the house for the party, with Khloe seen carrying an exhausted Mason to the car after his special night.

Check out more photos from the little guy's party above -- and even more shots of his super cute little sister!

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