Kailyn Lowry, Javi Marroquin

Teen Mom 2 star Kailyn Lowry gave birth to a baby boy over the weekend, Us Weekly reports.

Lincoln Marshall Marroquin was born Saturday afternoon and is the first child for Lowry and her husband, U.S. airman Javi Marroquin.

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"I am exhausted, but we are so excited and surprised by our new baby boy," Lowry tells Us.

Lowry, 21, has a 3-year-old son, Isaac, from a previous relationship with her ex Jo Rivera. She and Marroquin married in September 2012.

On Sunday, Lowry thanked her well-wishers via Twitter and posted an Instagram photo of a breastfeeding brochure.