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Catelynn Lowell and Tyler Baltierra are nothing if not honest with each other.

The Teen Mom stars have been together for years and years and are as candid with their feelings as any famous couple we can think of.

Heck, Tyler told Catelynn a few months ago that he wanted to live apart from her for 30 days — WHILE SHE WAS PREGNANT! — because he just needed some space…

… and their marriage has only thrived as a result of this admission.

What does this have to do with what Catelynn just told Us Weekly?

The veteran MTV personality explained to the tabloid that she and her husband have already had a discussion about something very personal.

What is it? And what does it have to do with growing their adorable family? Scroll down to find out!