It's been 26 years since Madonna and Sean Penn divorced, and with each concert he attends comes a new dating rumor!

The 55-year-old actor has been spotted at multiple concerts on the 57-year-old singer's Rebel Heart tour over the past few months ever since he split from girlfriend Charlize Theron back in June, according to Us Weekly. He was seen front row at her show in Canada Wednesday and was also photographed in the crowd last month in New York City alongside comedian Amy Schumer, who opened the show.

While onstage in Brooklyn in September, the singer opened up about her ex to the crowd, letting them know about the note he sent her following her Madison Square Garden show, as HNGN previously reported. "My ex-husband was there! Could you imagine?" she said to the crowd. "He had been at my show 30 years earlier when I was at Madison Square Garden." She then explained that the note Penn wrote let her know how much he "appreciates" her art.

It seems as though they may be spending some time together after hours as well. Insiders told Radar they were booked in the same hotel during her entire stay in Vancouver, adding that they have been "shacking up."

It also looks like it won't be the last she will be seeing of her ex-husband either as he is expected to follow her to Los Angeles as she finishes up this leg of her tour.

Madonna and Penn married just a few months after meeting on the set of her "Material Gril" video in 1985, but divorced in 1989 after abuse accusations, according to Entertainment Tonight. Since then, Madonna married and divorced director Guy Ritchie, and Penn married and divorced actress Robin Wright.

Neither of their reps would comment on the dating rumors.