The “Chicago Fire” actor proposed to the singer on Valentine’s Day 2015.and as recently as March, around her 30th birthday, there were rumors that the two had secretly gotten married."He gave me his heart on Valentine's Day, and I said YES!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.

The couple were first spotted getting cozy at a Jan.

28 Kings of Leon concert, and have been seen in PDAs since, including on the Super Bowl LI field before her acclaimed halftime show performance.

A source close to Ryan, 49, says the actress and the rock star, 59, began dating about seven weeks ago, and that Mellencamp and his wife had been separated for some time before that.

RELATED: Meg Ryan and John Mellencamp Step Out in New York The pair have been spotted having coffee at Espresso Love, one of Ryan’s favorite spots on the Vineyard, and grocery shopping at Gourmet Garage in New York’s So Ho neighborhood – where observers tell PEOPLE they seemed happy and at ease.

Embrace your differences, celebrate who you are, it's in the unique parts of you that greatness hides. “Thank you for continuing to inspire me to mold my fantasies into reality. I [love] You.” John also took to Instagram to praise Gaga. Beyoncé confirmed that she’ll be headlining 2018’s Coachella dates.

Embrace your differences, celebrate who you are, it’s in the unique parts of you that greatness hides.

Today I have focused on smiling about all that I'm grateful for and reflecting on the last ten years of music and performances we have shared together. A post shared by Lady Gaga (@ladygaga) on “I don’t know how to thank my fans enough for the love you have shown me over the years and always on my birthday,” she wrote, captioning a shot of herself wearing a black lace strapless dress with a thick diamond choker and black fur stole.

Thank you for continuing to inspire me to mold my fantasies into reality. “Today I have focused on smiling about all that I’m grateful for and reflecting on the last 10 years of music and performances we have shared together,” she added. Thank-you for being a part of mine.” FROM COINAGE: The Real Cost of Going to Coachella alum will be replacing Beyoncé as the top Coachella headliner on consecutive Saturday nights at the April music festival. ” Mother Monster captioned released Coachella poster on Feb. Gaga will be the first woman to be double-billing the festival since Björk in 2007.

Mellencamp has been married three times and has five children, including two sons with Elaine.