That diamond ring was also missing in a photo she posted Monday night after a day working with kids at a home for boys in Los Cabos, Mexico, where according to People she’s vacationing with friends.
There are no details out yet about how or why the breakup happened, and reps for the former flames weren’t immediately commenting.
Taylor's first acting role came in 2006, when he starred in the short-lived .
Taylor played Gaga's love interest - and fittingly, in the video Taylor wore her mother's wedding dress for various scenes - but the pair didn't begin dating until several months after meeting.
Taylor, however, keeps his account for keeping up-to-date with his fans, regularly retweeting fan art and reminding them to watch the show.
Kinney and Gaga -- real name Stefani Germanotta -- met in mid-2011 while shooting the video for "You and I," in which a shirtless Kinney tended to his lady in various incarnations, simulated sex with her and donned a white tux to marry her.
Rumors that they were dating surfaced soon after."We were in the middle of this scene and I remember that he kissed me," the "Poker Face" singer told Ellen De Generes in 2013.
But college was where Taylor discovered his passion for acting.
He told USA Today in 2012 that his acting class "held my interest outside of the classroom more so than any other subject I'd ever taken".