The Cover Drive singer told The Sun that her fellow pop star was caught in the act during an interview.
Reifer said: "I saw Aston in an interview looking at my behind on a red carpet.
"I can appreciate when someone is good looking but I need to get to know someone before I like them."
Cover Drive were recently confirmed as tour support for JLS and Alexandra Burke's upcoming 'Sound City Summer Tour', alongside Little Mix.
The group next month release their debut album Bajan Style, which features the singles 'Lick Ya Down', 'Twilight' and 'Sparks'.
Watch the music video for Cover Drive's 'Sparks' below: