The 'Problem' hitmaker, who recently started dating the rapper, 26, and was captured on camera holding his hand at the MTV Video Music Awards on Sunday (24.08.14), admits she doesn't ''know what to say'' about their new romance just yet.
Asked about her love life, the 21-year-old singer laughed and told 'On Air With Ryan Seacrest,' on Tuesday (26.08.14): ''I mean, I guess, curiosity man, it'll kill you. I don't know what to say, Ryan. Why are you doing this me?
''I'll tell you when we're not on the air. I trust you. I've known you a long time. I don't know about these millions of people listening in right now.''
A source close to the couple, who collaborated on the single, 'Best Mistake,' previously said: ''They have been friends since they made the song together.
''They have been spending more time together and recently have been getting very close. They are both doing great.''
Big Sean - real name Sean Anderson - ended his five-month engagement to 'Glee' beauty Naya Rivera, 27, in April.
Ariana also called time on her relationship with Jai Brooks at the beginning of August, as he had allegedly been unsupportive after her grandfather's death.