This is one thing you may want to avoid on your wedding day.

While newlywed Chinese couple was enjoying some time with their family and friends after the ceremony, an “unwelcome” guest came at the reception - - the groom’s heavily pregnant mistress.

And the pregnant mistress was all prepared to make her appearance at the wedding reception known to many when she attacked her former lover’s new bride.

The catfight was caught on video and has gone viral online.

A look at the video showed that the pregnant mistress attacked the new bride and was screaming on top of her lungs. The groom was just looking and not coming into anyone’s defense.

But a couple of minutes into the fight, the groom decided to step in. But there was no stopping the angry mistress.

Assisted by the waiters and more personnel at the reception, all six to seven of them, the groom was able to separate his new bride and former mistress.

The screaming woman attacked the bride continuously, only to stop when she was catching her breath. The pregnant mistress was seen clutching her belly and heard moaning in pain.

It should be interesting to note that both the new bride and the mistress were wearing white gown. Most news outlets claim that the woman was pregnant based on the transcription of the video conducted by The Nanfang.

The transcription of the exchange showed that bride was accusing her new husband’s mistress of ruining her wedding day.

"You didn't have an abortion while you could and now you come here with your big stomach,” the bride was quoted as saying by the Sydney Morning Herald.

Screaming back to the pregnant mistress, the new bride cast doubt on the baby’s father. She also told the pregnant mistress that she and her new husband may not be able to afford her demands.

"How do I know whose kid it is? Are you trying to coerce us into buying you a house? Can we afford it?" the bride continued, according to the Sydney Morning Herald.

The video also showed the husband finally confronting his former mistress. Aside from the pain in her stomach, seeing the husband screaming was the only thing that stopped the unidentified woman from attacking the new bride. The groom, according to the Sydney Morning Herald asked the pregnant mistress to go home.

The groom was last seen going to his new bride who was then seen crying after the unfortunate incident.

The wedding was held at the Chinese city of Shenzhen.

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Credit: YouTube/WorldNewsTD