The 21-year-old star has been dating the rapper for the past few months and her representatives have strongly denied recent reports claiming they are no longer a couple.
A member of Ariana's camp told MailOnline that the claims are ''absolutely'' false, insisting the couple remain together.
The denial comes shortly after a report in Star magazine alleged that the 'Bang Bang' hitmaker found some saucy photos on the phone of the 25-year-old rapper.
An insider told the publication: ''She refuses to return his calls. She feels completely violated and has lost all trust in him.
''His grandma passed away a few days later and she hasn't even called to check up on him. They're done!''
Big Sean's grandmother passed away on December 23 and he recently took to social media to pay tribute to her.
He wrote: ''My grandma passed away a couple days ago. I haven't said anything to anyone because honestly I feel like she's still here.''
Ariana and Big Sean first went public with their relationship in October and have regularly been seen together since.
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