Robbie Williams may have broken Russian law after flicking his middle finger at watching fans during the World Cup opening ceremony.
The country clamped down on explicit language in the arts in July 2014, banning the use of swear words in the arts.
Those who break the law will face "fines of between $70 and $1,400 depending on whether they’re an individual, an official or an organisation."
The 44-year-old singer flipped his middle finger during a performance of "Rock DJ" at the Luzhniki Stadium in Moscow ahead of Russia's opening match against Saudi Arabia.
Williams' actions received a lot of attention on Twitter.
One user was in disbelief, asking, "Did Robbie Williams just put the middle finger up just now or am I bugging??"
Another user wrote, "Turned on FOX just in time to see Robbie Williams give the middle finger to the worldwide audience. God, I love the World Cup."
Some people were furious about Williams' action with one person tweeting, "Robbie Williams swearing at the camera at the opening ceremony of the World Cup just shows you what a tactless and classless person he is. Absolutely disrespectful and coupled with a nonchalant performance. He won’t care though. He will still get paid millions for it."
Williams - dressed in a red leopard print suit - performed a number of hit tracks alongside Russian opera singer Aida Garifullina.
In theory, Williams could face punishment as a result of his transgression, however it's unlikely that the host nation's choice World Cup opener would face sanctions.
