The 25-year-old singer confirmed as much in an interview with People published Thursday. Sparks and the 22-year-old rapper were first linked after the star started sharing photos with her beau in April.
"I think they're pretty obvious," she said of the coupled-up snapshots.
"We're having fun. He's a really good guy, and the pictures speak for themselves ... I don't just kiss people!"
Sparks was previously involved with R&B singer Jason Derulo for nearly three years.
The former couple seemed to be heading toward marriage, but abruptly broke up in September 2014.
Sparks later expressed confusion about the split, saying she hasn't spoken to Derulo since.
Sparks came to fame after winning sixth season of Fox reality competition "American Idol," and is expected to release her third studio album, "Right Here, Right Now," in May.
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Sage the Gemini debuted his first record, "Remember Me," in March 2014.
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