Usher's Super Bowl halftime show had a lot of people raising eyebrows over his Alicia Keys moment -- something he's not sorry about ... but he is apologizing over something older.
On Monday, Usher zoomed in to The Breakfast Club to address his PDA with Alicia Keys at the SB but also came clean about the internet resurfacing his 2014 VMA performance with Nicki Minaj.
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During their set at the time, Usher bumped and grinded on Nicki's booty onstage -- and then smacked it with his hand.