The photo features Sarah, Sean, Max and Cece Jessen -- Michael and Sarah's daughter -- all smiling at each other while standing arm in arm.
"What A Great Day," Max captioned the image, which shows Sarah wore a form-fitting embroidered dress with a V-neckline and her hair pulled back with a veil.
Sarah and Sean apparently had a small post-wedding reception at a waterfront restaurant in Greenwich, CT, with just over a dozen guests.
In another Instagram photo Max uploaded on Sunday, he can be seen sitting at a large dinner table in the restaurant with Sarah, Sean, Michael, and Michael's fiancee on90 Day Fiance's seventh season, Juliana Custodio de Sousa, among other smiling loved ones.
The photos provide evidence Michael and Juliana are still together and living in the United States.
The large dinner table was decorated with two simple yet elegant arrangements of light-pink and ivory roses.
Sarah subsequently confirmed she's a married woman on Facebook and Instagram on Monday.
"Best day of my life," Sarah captioned the photo of Sean, Max, Cece and herself on Facebook.
And when Sarah shared her big news on Instagram, she tagged her son Max, Michael and Juliana in her post.
Michael, a 41-year-old independent and self-employed wine entrepreneur from Greenwich, welcomed Juliana from Goiania, Brazil, to America on 90 Day Fiance's seventh season.
The pair had 90 days to marry once Juliana arrived in the United States on her K-1 visa.
Although Michael and Sarah are divorced, Michael said they've managed to stay very close friends in order to co-parent Max and Cece.
Michael revealed he had dated Sarah young and the pair welcomed children young and eventually grew apart. They apparently became very different people once they got older.
At first, Sarah wasn't sure what to make of Juliana's intentions or her relationship with Michael, but she seemed to be supportive as long as Max and Cece would remain Michael's top priority.
In a recent episode of 90 Day Fiance, Sarah was shown meeting Juliana for the first time and telling the young model not to parent at all; however, Sarah later clarified the context in which she had made that demand, which seemingly made Juliana uncomfortable at the time.
"The 'I don't want you to parent' comment was cut mid sentence. What they edited out was the reason I have her which was 'you're adjusting to a new home, a new country and have a new relationship. I don't want you to feel the added stress of feeling the responsibility of trying to parent Max and Cece,'" Sarah wrote in a 90 Day Fiance Facebook group, which later circulated online.
Sarah insisted she was not laying down a rule but was rather trying to be supportive of Juliana.
"Juliana and I are EXTREMELY close," Sarah added, "and I hope the producers will end up showing how our relationship has evolved and you will stay tuned with an open mind and heart."
90 Day Fiance's seventh season currently airs on Sunday nights at 8PM ET/PT on TLC.