Heidi Klum has been dating Vito Schnabel for three years.
But a source has told DailyMail.com that things have not been going so well for the 44-year-old German supermodel and the 31-year-old New York-based art curator for the past several weeks.
'It's definitely a case of trouble in paradise for the couple,' a friend said. 'They haven't been pictured together at all recently, and Heidi stayed in a hotel during her recent trip to New York.'
Rough waters: Heidi Klum and Vito Schnabel are having rocky times, a source has told DailyMail.com. Here they are seen in February
She arrived on September 7.
And when the America's Got Talent judge attended the Harper's Bazaar Icons event in NYC over the weekend, she was not with Vito, who is the son of artist Julian Schnabel.
'Heidi's been spending lots of time partying with her friends,' the source told DailyMail.com.
No Vito here! The 44-year-old siren looked to be in a party mood when she posed with Lewis Hamilton and Swizz Beats at the 2017 Harper ICONS party in New York over the weekend
The dress that screams I'm single: 'It's definitely a case of trouble in paradise for the couple,' a friend said. 'They haven't been pictured together at all recently.' Seen on August 27
'She was also seen with Lewis Hamilton at the the Harper's Bazaar event. Friends are wondering if this could possibly be the end?'
Also over the weekend Heidi was by her ex-husband Seal's side as she threw a big birthday party for one of her sons.
Heidi and Vito were last seen holding hands in NYC on August 21.
So happy just months ago: Here the two kissed at the 25th Annual Elton John AIDS Foundation's Academy Awards Viewing Party in LA
In June eyebrows were raised when she was pictured kissing a mystery brunette.
Vito was spotted in an embrace with the woman in the early hours of in London. This comes while Klum was in New York filming new episodes of America's Next Top Model.