However, social media accounts of this other woman suggest she has not yet given birth.
Share 'A famous doctor from Italy was the key to helping the birth with the assistance of academician Gennady Sukhikh, director of the medical centre.
One major newspaper Moskovsky Komsomolets carried the story on its website only to suddenly delete it and wipe all mentions of the claims, including from the internet cache.
Alina Kabaeva attends Legends of Sports, a costumed gymnastic show at Megasport Arena in Moscow in 2016 But the twins report does not fit this theory.
Intriguingly, Russian researchers say Karmanov is close to oligarch Arkady Rotenburg, one of Putin's oldest friends, and his former judo sparring partner.
Other reports frequently allege Kabaeva - like Putin - has undergone facelifts and other plastic surgery.