Lady Gaga and Taylor Kinney have reportedly ended their engagement after five years together.
Actor Taylor proposed to the pop superstar on Valentine's Day in 2015, and the couple was reportedly planning to tie the knot later this year.
However, sources tell TMZ.com the stars called time on their relationship earlier this month and quietly split.
Representatives for Gaga and Kinney have yet to comment on the news, which emerges as the Born This Way hitmaker enjoys a vacation in Mexico with a group of friends.
The singer was spotted partying in Cabo San Lucas over the weekend, when Taylor was noticeably missing from her crew.
The Chicago Fire actor marked his 35th birthday on Friday - the same day Gaga was pulled over by a police officer in Malibu, California because her vehicle didn't have license plates. Photos taken of the musician on the day also reveal she was not wearing her engagement ring during her Malibu outing.
Gaga and Taylor began dating in 2011, after he played her onscreen love interest in her You and I video.
After the news of their engagement broke online last year, the bride-to-be took to her Instagram.com page and shared a photo of her heart-shaped diamond ring with fans.
She captioned the black-and-white snap, "He gave me his heart on Valentine's Day, and I said YES!"
The stars had been keeping their wedding plans under wraps, and earlier this year, reports surfaced suggesting they were preparing to jet to Europe for a traditional Italian wedding, a nod to Gaga's heritage.
Taylor dismissed the claims in March, insisting the couple had yet to finalise any plans.
"I keep hearing about wedding plans through the media," he told U.S. talk show Live! with Kelly and Michael. "I guess I'm getting married in Italy and it's more interesting than whatever the heck I would come up with.
"I'm like, 'Can I come? Am I going?' (The Pope) will be there, I guess he's going to sing."
Explaining why the pair had not locked down wedding details, he continued: "We're both pretty busy. Down the line we'll figure it out. We've talked about New York or Los Angeles, Christmas or summer, but who knows."