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Catelynn Lowell Just Got A Very Sparkly Surprise From Tyler Baltierra

See the special bling!

Back on Season 1 of "Teen Mom," a then-teenage Tyler Baltierra tearfully asked for his girlfriend Catelynn Lowell's hand in marriage. His poignant proposal, along with her gleeful "yes," made the emotional occasion an unforgettable moment for the longtime couple, as well as their many fans. Now, more than five years later, the expecting lovebirds just got engaged -- again! -- on Christmas.

Catelynn Lowell's Instagram

"Babe got me a new engagement ring," the 22-year-old excitedly gushed on Instagram while flashing her round-cut diamond. "I wasn't expecting this at all." A special bonus to the sparkler: an additional stone to signify their daughter.

"It even has a baby diamond on the bottom to represent our new little girl," Cate continued about her bling. "Thank you so much @tylerbaltierramtv I love you!"

Speaking of their wee one in the oven, Cate is nearing the final stretch of her pregnancy, and she's understandably ready to welcome her precious peanut in the very near future.

Take a wonderful trip down memory lane and relive Tylynn's engagement -- as well as the blushing bride-to-be's reaction -- and be sure to keep checking MTV News for updates on their bundle of joy!