Last year, the Fashion Police star referred to Aguilera as a "fat bitch" after co-host Joan Rivers suggested that Aguilera looked like "Snooki's Scandinavian cousin".
Osbourne later defended the insult, claiming that the Voice coach and singer had been making fun of her weight for years.
Appearing on Bravo's Watch What Happens Live, host Andy Cohen questioned Osbourne on the bad blood between herself and Aguilera, though Osbourne had only positive things to say.
"I think she's looking way better right now, she's got a great voice and she's got a beautiful son," Osbourne said.
Aguilera has not yet responded to Osbourne's latest comments.