One "Teen Mom 2" star is now the mother of two!

Kailyn Lowry and her husband Javi Marroquin welcomed son Lincoln Marshall Marroquin on Saturday. The baby boy weighed 8 pounds 6 ounces.

In a new photo from In Touch, Kailyn's first son Isaac is seen holding onto his little brother, with a BIG smile on his face. So cute, right?

Isaac, Lowry's 3-year-old son with ex Jo Rivera, is getting so big too!

This is the first child for Kailyn and Javi. The couple officially tied the knot in September 2012 and held an aquarium wedding this past September.

Congrats to the growing family!

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