Vladimir Putin’s rumored ex-lover, Alina Kabaeva, 40, sparked concerns among her fans this week after she made a rare public appearance in southern Russia, RadarOnline.com has learned. Kabaeva, a former Olympic gymnast, was rumored to have been in a long-term relationship with Putin for over two decades before the pair’s suspected romance ended earlier this year. Putin and Kabaeva’s separation reportedly allowed the 71-year-old Russian leader to move on with a 39-year-old art historian named Ekaterina Mizulina. But according to Daily Star, Kabaeva – who had been keeping a low profile during bo…