"This wedding can't go on … this man here is my husband," she says, as she marches up the aisle.
Guests can be heard gasping in the background as the groom looks on with his hand on his chin.
Meanwhile, his new bride offers no reaction as Muyunda's alleged wife continued yelling while the bridal party tried to calm her down and stop her from approaching the new couple.
With her face mask hanging off her face, she then argued with a woman in a front pew before going to remonstrate with the clergyman.
"This man is my husband. We haven't divorced," she told him, adding that "we never quarrelled … I don't know what is happening here".
She was seen carrying a baby in a papoose strapped to her back with her other children reportedly in tow as she stormed into the Roman Catholic church in Chainda, an area of the capital Lusaka.
The footage is cut before it is revealed what happens next. However, according to local media, Muyunda was taken to a police station, with his new bride allegedly aware he was married.
Reports claim Muyunda, who has three children, could be charged with bigamy and faces up to seven years in jail.
The UN states that Zambia has two different marriage systems, one based on customary law and the other on modern statute law.
The latter does not allow for polygamy, and anyone who tries to get married under statute law when they already have a husband or wife is liable to prosecution.