It couldn't have been about the backlash that he's received for performing at the controversial World Cup (many people aren't happy that Russian Federation has been allowed to host it), as that mostly started to leak out while he was performing.
The 15-minute show, produced by Russia's state Channel One, broke from World Cup tradition, focusing on musical acts, including a performance of Pyotr Tchaikovsky in front of full stands at the capital's main stadium. Eastern (9 a.m. Pacific).
Former Brazil striker Ronaldo - known as "O Fenomeno" - will also be taking part in the opening ceremony, Federation Internationale de Football Association said.
Read on for a look at what to know ahead of the opening ceremony.
The football glory that all players will be hoping to achieve on Russian soil will be represented by Brazil's two-time FIFA World Cup champion Ronaldo. The opening ceremony is held in Luzhniki Stadium, which will also host the final, according to Telegraph.
Here is the official world cup anthem. However, NBC Universo is not included with Hulu Live TV.
A third option that also offers a 7-day free trial is Sling TV.
The former French global, who was part of the team that claimed World Cup glory on home soil in 1998, also said he hopes this year's hosts can at least reach the knockout stages.
WORLD CUP 2018 PERFORMERS: Diplo and Will Smith are reported to be performing.
But Williams chose not to sing the song, instead performing a medley of his hits as Putin, Saudi Arabian Crowd Prince Mohammed bin Salman and Federation Internationale de Football Association president Giovanni Infantino sat in the stands.
Russian operatic soprano Aida Garifullina then made her way on to the playing field, riding on what appeared to be a large phoenix. Singers Placido Domingo and Juan Diego Florez are participating, as are pianist Denis Matsuev and opera stars Anna Netrebko, Yusif Eivazov, Ildar Abdrazakov, and Albina Shagimuratova.