Russia's prosecutor general recently claimed that Lady Gaga and Madonna entered the country under incorrect paperwork.
"[Their documents] do not grant their bearers the right to engage in any commercial activity," stated Russia's prosecutor general.
Madonna performed in Russia last August, while Lady Gaga appeared at the end of last year.
According to The Guardian, Russian prosecutors may ask Russia's foreign ministry or federal migration service to press charges against the singers.
Lady Gaga and Madonna's paperwork mistakes were discovered by Vitaly Milonov, who wrote St Petersburg's law banning gay "propaganda."
Both Lady Gaga and Madonna spoke in support of gay people during their 2012 concerts.
Lady Gaga hit back at the news from Russia today on her Twitter page where she promised to fight for the freedom of LGBT people in Russia, but didn't mention exactly how:
Sending bravery to LGBTs in Russia. The rise in government abuse is archaic. Hosing teenagers with pepper spray? Beatings? Mother Russia?... The Russian government is criminal. Oppression will be met with revolution. Russian LGBTs you are not alone. We will fight for your freedom... Why didn't you arrest me when you had the chance, Russia? Because you didn't want answer to the world?