The "Kiss from a Rose" singer, 48, was spotted at a Los Angeles studio on Monday wearing a gold band on his left ring finger.
The duo – who announced their "amicable" separation on Sunday – shocked pals with their news.
"The Heidi and Seal I knew was the couple everyone loves," a fashion industry source who's worked with Klum, 38, told PEOPLE right after hearing about the separation. "[They were] super passionate and in love."
