Chelsea Houska is known for sharing heartwarming Baby DeBoerupdates -- and the Teen Mom 2 cast member's bun in the oven just got some special attention from his mama's MTV cohort.

"Loverrr @kaillowry," Aubree's parent captioned the Instagram image above, which finds Kailyn Lowry (both were in Los Angeles for a TM2taping) sweetly touching her pal's bump. From 16 and Pregnant to a second bundle of joy -- my, how far these ladies have come through the years.

In addition, Chelsea -- who is due in February -- shared a cute GIF of Kail giving her son a bit of love. Won't be long before these two are holding the "little Coley"!

- Jordana Ossad

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