As a new season of Teen Mom 2 kicks off on MTV this week, there are some new beginnings for the OG cast as well. Series star Amber Portwood just welcomed a son with boyfriend聽Andrew Glennon.

鈥淪o excited to announce the birth of our son!鈥 Portwood wrote on Instagram, sharing a sweet photo of her first moments with her newborn with聽Us Weekly.聽The baby boy was born on Tuesday, May 8, and聽as聽Portwood previously confirmed on Twitter,聽his name is James Andrew Glennon.

Baby James joins big sister Leah, 9, whom Portwood co-parents with her ex Gary Shirley.聽The MTV star聽first revealed that she and Glennon were expecting back in November, telling Us Weekly at the time that while she was initially nervous, it didn鈥檛 take long for the excitement to kick in. 鈥淚 just kind of sat down and thought about it and realized that it was a big step in my life, and it was a good thing actually,鈥 she said. 鈥淎nd I was happy in about 30 minutes.鈥

The news of Portwood鈥檚 pregnancy surprised fans during the most recent season of OG. After ending聽her often-difficult relationship with ex-fianc茅 Matt Baier, she began dating Glennon 鈥 whom she met while appearing on聽Marriage Boot Camp聽with聽her ex 鈥 and the two quickly hit it off. Congrats to the growing family!

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(photo via聽Alberto E. Rodriguez/Getty Images)