Jandiroba and Dern can weigh no more than 115 pounds for the championship bout. The UFC 321 official weigh-in video starts at 1 a.m. ET. Watch a replay of MMA Fighting’s official weigh-in live stream below. The UFC 321 ceremonial weigh-in video starts at 10 a.m. ET.

Jandiroba has won five straight, and she has won six of seven since the loss to Dern. Dern has had her ups and downs since their first fight, but she enters this fight off two straight wins and three wins in her last five fights.

With UFC 321 fight week now upon us, fans can get ready for the card’s main event by watching all of Tom Aspinall’s UFC finishes in one video package.

Dern enjoyed an incredibly successful jiu-jitsu career before transitioning to mixed martial arts. That included becoming an ADCC and no gi BJJ (black belt) world champion, and rising to stand as the world’s No. 1-ranked IBJJF competitor.

Virna Jandiroba has been tearing through the UFC women's strawweight division in recent years. In April at UFC 314, the Brazilian contender topped an impressive five-fight winning streak by defeating former UFC title challenger Yan Xiaonan in a dominant unanimous decision win.

Virna Jandiroba and Mackenzie Dern hit their marks and made their UFC 321 vacant strawweight title fight at official weigh-in.