The rapper has been dating the 'Problem' singer for two months but has been a big fan of her musical talents for some time.
He said: ''Me and her make a lot of music together and the chemistry between me and her when we work is great.
''We got more in the works too. I feel like her voice is crazy, [just] that that big voice comes out of her is insane. I was probably one of the first people to tweet about her music; me and her been friends for years before anything else...
''I was the first rapper to perform at the White House, I performed there with Ariana so that was an honour.''
The couple - who previously worked together on 'Best Mistake' and 'Right There' - haven't publicly confirmed their relationship but were caught on camera backstage at the recent MTV Video Music Awards (VMAs) holding hands.
However, Sean insists he didn't mind.
He told MTV News: ''I had no problem with it.''
The new couple's romance came as a shock to fans as Big Sean - whose real name is Sean Anderson - only ended his five-month engagement to 'Glee' actress Naya Rivera in April this year.
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