Catelynn Lowell received an unexpected gift on Christmas day.

'Teen Mom' Catelynn Lowell 'Can't Wait' For Her Daughter's Arrival

With less than a month remaining in her second pregnancy, the Teen Mom was given an exciting gift on Christmas -- a brand new engagement ring. On Instagram, Lowell shared the special gift, which was given to her by fiance Tyler Baltierra, with fans.

"Babe got me a new engagement ring.... I wasn't expecting this at all," Lowell wrote on Instagram on Thursday. "It even has a baby diamond on the bottom to represent our new little girl.... thank you so much @tylerbaltierramtv I love you!"

Lowell and Baltierra have been together for about a decade with much of their relationship documented on reality TV.

In 2009, the pair appeared on MTV's 16 & Pregnant, where they were seen welcoming their first child, Carly, whom they chose adoption for. Several months later, they went on to appear in MTV's Teen Mom. They've also been seen on VH1's Couple's Therapy.

Pregnant 'Teen Mom' Catelynn Lowell's Latest Baby Bump Photo

In recent months, Lowell and Baltierra have been preparing, not only for their new baby, but also for their upcoming reality TV return in season 5 of Teen Mom.

The show had aired in 2012, following Amber Portwood's five-year prison sentence, but will return to MTV next year, along with the original cast, sans Farrah Abraham.

Lowell and Baltierra's second daughter is due in mid-January. In the video below, the reality couple can be seen finding out the sex of their baby.

It's a......... A video posted by Catelynn Lowell (@catelynnmtv) on Aug 8, 2014 at 11:38am PDT

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Catelynn lowell, Tyler Baltierra, MTV, Teen mom, Engagement ring, Reality TV