All but one fighter made their contracted weight this afternoon, but the main event fighters stole the show when an immediate scuffle ensued once Belfort approached Rockhold.
The UFC brass quickly broke the two apart once the confrontation became physical.
Full weigh-in results are as follows:
MAIN CARD: (FX, 9 p.m. ET)
Vitor Belfort (186) vs. Luke Rockhold (186)
Chris Camozzi (186) vs. Ronaldo Souza (186)
Rafael dos Anjos (156) vs. Evan Dunham (156)
Rafael Natal (186) vs. Joao Zeferino (185)
PRELIMINARY CARD: (FUEL TV, 6 p.m. ET)
Hacran Dias (146) vs. Nik Lentz (146)
Mike Rio (156) vs. Francisco Trinaldo (154)
John Cholish (156.2)* vs. Gleison Tibau (156)
Michel Prazeres (171) vs. Paulo Thiago (170)
Yuri Alcantara (136) vs. Iliarde Santos (134)
Roger Hollett (204) vs. Fabio Maldonado (205)
PRELIMINARY CARD: (Facebook, 4:30 p.m. ET)
Azamat Gashimov (126) vs. John Lineker (126)
Chris Cariaso (126) vs. Jussier Formiga (126)
Jeremy Larsen (155) vs. Lucas Martins (153)
*John Cholish given one-hour to drop the additional 0.2lb.