The former Oasis star was seen leaving his home in the UK capital on Thursday without the band on his left hand, just days after his pop star wife Nicole Appleton was also snapped without her ring.
The couple's union has come under scrutiny after it emerged Gallagher is facing legal action from New York-based showbusiness reporter Liza Ghorbani, over allegations he fathered her young daughter.
Gallagher recently returned from touring in Europe while his wife and son are enjoying a family vacation in Florida.
The former All Saints' singer's mother Mary previously revealed Gallagher had been due to join his partner on the holiday, but he was instead snapped partying on the Spanish island of Ibiza before returning to London.
Mary also claimed her daughter was devastated by the love child allegations against her husband: "My daughter's whole world has suddenly collapsed... It's a horrible mess..."