Singer Janet Jackson turned down an invite to the Grammys after declining to apologise on air for bearing a breast on live TV, network CBS said.
Jackson was exposed during a routine with Justin Timberlake
Jackson's publicists said that on Saturday CBS and Grammy officials had reversed a call for her to stay away.
A Grammys spokesman said she had "always" been invited. CBS said it had "serious reservations" about her being there after the TV Super Bowl furore.
CBS said Justin Timberlake had agreed to apologise for his part in the saga.
After accepting his second Grammy of the night for best male pop vocalist, Timberlake said: "I know it's been a rough week on everybody.
"What occurred was unintentional, completely regrettable, and I apologise if you guys are offended."
Timberlake apologised for a second time
It was Timberlake's second public apology after he ripped the top of Jackson's outfit during live TV coverage of the Super Bowl a week earlier.
The incident, during the biggest TV audience of the year, has prompted an investigation by the Federal Communications Commission.
CBS, which broadcasts the Super Bowl and the Grammys, faces possible sanctions.
Jackson, who had been due to present a Grammy to Luther Vandross, had also apologised earlier this week in a videotaped statement.
There were a few references to Jackson during the Grammys broadcast, shown with a five-minute delay to prevent any further possible offence.
Christina Aguilera, receiving an award for female pop vocalist, held the straps of her gown in place during her acceptance speech, saying: "I don't want to have the same thing happen that Janet had done... if I can keep it together."
CBS briefly put a graphic onscreen that obscured Aguilera's cleavage.
Jakob Dylan, announcing Timberlake's award, offered an apparently tongue-in-cheek word of caution, telling him: "Behave".
Queen Latifah tried to steer attention back to the music, saying: "Sometimes its not about celebrity; it's not about controversy; it's not about gossip. It's just about music and the power of the human voice."
Musician Dave Matthews, who won an award for best male rock vocal, said backstage: "It doesn't seem like it should deserve such attention. There have been (breasts) since before there was entertainment."