Whitney Houston Whitney Houston

Whitney Houston refused to buckle her seatbelt onboard a Delta flight from Atlanta on Wednesday, People has confirmed.

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The 48-year-old Grammy winner "had words" with a crew member who asked the singer to fasten her seatbelt. After she was warned that she would be kicked off the Detroit-bound flight if she didn't comply, Houston eventually allowed a flight attendant to buckle her in.

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"She wasn't drunk, drinking or on drugs; she was just exhausted," a source told People.Houston has kept a low-profile of late, after reportedly extending her stay at a rehab facility in June.