Dennis, 37, first shared a #TBT photo from 2018 of Porsha holding a bouquet of roses on a flight for her birthday.
He turned the comments off for that particular snap.
He also posted a photo of their daughter Pilar, who turned three months old on the same day as Porsha's birthday. The comments were turned off for that pic as well.
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Sources for E! confirmed that Porsha and Dennis broke up eight months after announcing their engagement.
The RHOA star fueled speculation that she and Dennis split after she unfollowed him on Instagram in May.
Rumors swirled at the time that he cheated on Porsha with WAGS Atlanta star Sincerely Ward. Both parties denied the allegations.
She unfollowed him for a second time on Instagram following his cheating allegations.