Catelynn Lowell is especially grateful for the life partner in whom she has found Tyler Baltierra.

On Thursday, July 15, the teen mom star took a trip back in time in honor of its 15th anniversary. Catelynn, who is currently pregnant with a baby, has shared several photos showing the development of their love story – since they first met as a teenager and adopted her daughter Carly, now 12, in the MTV series, to become parents of daughters Novalee, 6, and Vaeda, 2.

“Happy 15 years to the love of my life and my best friend,” enthused Catelynn, 29, on Instagram. “Wow, 15 years old! The things we’ve been through together are crazy. An unplanned pregnancy, an adoption trip, mental health problems, multiple pregnancy losses, but also travel, loving memories and parenting together … some of these things would be torn up” a few APART!”

Despite such challenges, Catelynn said she and Tyler “exceeded the odds”, wrote, “Now look at us with our 3 beautiful daughters and one more on the way and the love we have for one another is something that blows my mind. ”