The exciting announcement was shared in a preview clip for an upcoming episode of Teen Mom OG.
In the teaser trailer, Mackenzie breaks the news to one of their series producers by showing her a positive pregnancy test.
'Yay', she says, clearly thrilled.
This will be Mackenzie's and Ryan's first child together, although both have children from prior relationships.
The pair eloped last May before Ryan went to rehab for substance abuse.
His Teen Mom co-star Amber Portwood said Ryan has been recovering well since his stint in rehab.
'Ryan’s doing great now,' she told Us Weekly in June. 'He has a lot of support.'