Page Six reports that the "end is near" for the 44-year-old song bird and her 33-year-old husband, who are said to be "living separately."
"He hasn't been staying at their home," Page Six quotes a source. "He's been living out of hotels. They're fighting a lot." The legendary diva has even supposedly hired security to keep him away from other women, as she suspects Cannon of cheating.
Though Mariah's rep tells ET that she doesn't "comment on Mariah's personal life," there are some clues that the longtime couple could be on the rocks. Here are four:
1. No Photos. The two haven't been photographed together in months. The couple's last public appearance was all the way back in February for the premiere of her "You're Mine" music video.
Mariah, an active social media user, has also not posted any pictures with Nick since Father's Day in June, when she posted this adorable family snapshot:
2. No Vow Renewal. The two have also renewed their vows every year since they got married in 2008 -- except this year. ET was with the couple last year, when they renewed their vows in an over-the-top Disneyland celebration.
3. A Solo Valentine's Day. Mariah also surprisingly admitted to ET that the two were spending Valentine's Day apart this year. And this is a woman who lives for holiday moments!
"I will be sitting at home alone, just alone, pining away, being like, 'Thanks Nick, hope you're having fun at All Star Weekend,'" she candidly told ET about her holiday plans. " ... I can't be mad at him, he's working, you know? I know a lot of people that don't work at all. So, let's be happy that the man is working and I know he'll be with us, and he's in our hearts."
4. Where is Home? In July, the couple also sold their Bel-Air mansion for over $10 million -- reportedly because they wanted to raise their twins Monroe and Morocco in New York City -- but the timing is now questionable given the recent split rumors.
Tell us: Do you think Mariah and Nick will announce a split soon?