Lady Gaga on Oprah After Cancelling Show

Pop star Lady Gaga performed on "The Oprah Winfrey Show" Friday, a day after calling off a concert at Purdue University because of an undisclosed illness.

The singer showed no apparent signs of illness as she performed a medley of her hits on the live show Friday. She wore a black outfit studded with spikes and, at one point, swung a gold, spiked ball on a chain into the windshield of a taxi on the stage.

Lady Gaga's Eye-Catching Style

The concert cancellation was announced from the stage Thursday night after opening acts Jason Derulo and Semi Precious Weapons had already performed.

The Insider: Lady Gaga Collapses in Indiana

A statement released by the school from Lady Gaga's tour management said she'd suffered a sudden illness and that medical personnel had advised her not to perform.

The concert was rescheduled for Jan. 26.

A loud expletive chant came from the crowd of about 6,000 after the cancellation announcement, but soon died out and the fans left Elliott Hall of Music without incident.

Lady Gaga's song "Bad Romance" is No. 2 on this week's Billboard Hot 100.