On Monday, actress Meg Ryan was spotted wearing a ring on that finger while doing some shopping in New York City.
Last month, Ryan was also seen with the same ring while taking a romantic walk with Mellencamp in Tribeca.
In July, it was reported that Meg and John had rekindled their romance after they were seen showing some PDA during a run for ice cream. At the time, a source told Page Six, "They are together. It's been a few months.”
Earlier this year, John opened up on his relationship with Meg, telling Howard Stern, "I loved Meg Ryan. She hates me to death. I think it's because I'm a child… She just doesn't want anything to do with me. And I can't blame her.”
The pair called it quits in 2014 after three years of dating.