Featherweight Conor McGregor poses for his pre-fight photoshoot ahead of UFC 189 in Las Vegas.

Chad Mendes smiles for the cameras during his UFC 189 open workout in Las Vegas.

Middleweight Robbie Lawler salutes the fans and media at the UFC 189 open workouts.

Conor McGregor works out in front of fans and medi before UFC 189.

Octagon Girls Chrissy Blair, Carly Baker, Vanessa Hanson and Kahili Blundell at a Las Vegas pool party.

The MGM Grand packed with Irish fans for the UFC 189 weigh-ins.

Brazilian bantamweight Thomas Almeida weighs in for UFC 189

Dennis Bermudez stands on the scales at the UFC 189 weigh-ins.

Robbie Lawler and Rory MacDonald face off on stage at the UFC 189 weigh-ins.

Conor McGregor lets out a war cry at the UFC 189 weigh-ins in Las Vegas.

Chad Mendes and Conor McGregor stand across from each other on the UFC 189 weigh-in stage.

Conor McGregor walks back through the fans after beating Chad Mendes at UFC 189

Conor McGregor walks through the curtain backstage at UFC 189 with the interim featherweight belt.