Celebrity Parents 'Teen Mom 3' Alum Alex Sekella and Husband Tim Peters Welcome Baby Girl, Reveal Her Name Alex Sekella welcomed her second child — a baby girl with husband Tim Peters — on Sunday By Tristan Balagtas Tristan Balagtas Digital News Writer, PEOPLE People Editorial Guidelines Published on February 1, 2022 08:01 PM Share Tweet Pin Email Photo: sekella10/Instagram Alex Sekella is a girl mom times two! The Teen Mom 3 alum revealed that she welcomed her second baby on Sunday, her first with husband Tim Peters. On Tuesday, Sekella, 28, announced Althea Meredith Peters' arrival in a precious Instagram post featuring a trio of snapshots. Maci Bookout Breaks Down on Teen Mom: Family Reunion — 'I Am Not Enough' "I would like to introduce ALTHEA MEREDITH PETERS Born 1.30.22 5:12am 7.12lbs 18.5" long," Sekella — who was first introduced to fans on season 4 of 16 and Pregnant in 2012 — wrote in the caption. One shot shows baby Althea donning a pink onesie that reads, "Happy Little Princess," while the proud parents pose with the newest addition to their family in another picture. Althea joins 10-year-old Arabella, whom Sekella welcomed with ex Matt McCann in 2011. According to an Instagram post by Sekella earlier this month, Peters officially adopted her older daughter a week before baby Althea's arrival. Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories. "It has been a VERY VERY LONG process but we can finally say Arabella is a PETERS!! 🎉," the mom of two captioned a smiling shot of the family in a courthouse. Many of Sekella's fans were quick to praise her husband, while others shared their adoption stories. RELATED VIDEO: Daughter Asks Mom's Boyfriend to Adopt Her Teen Mom 3 Alum Alex Sekella Is Engaged! See Her Ring "I was adopted by my step-dad when I was 9 and it's the best thing that's ever happened to me. So glad Arabella has been given the same blessing. 💕 CONGRATULATIONS to all!" one follower wrote. Another commented, "Love this for you! My son was adopted by my husband 7 years ago and it was the best day of our lives." Sekella married Peters on April 25, 2020, following over a year-long engagement. Prior to getting engaged, the couple dated for four years.