It's not clear when the comments were made. But the insults began flying after someone brought up the 16-year-old's recent feud with Radiohead after Cyrus wasn't allowed to hang out with the band after the Grammys.
Foxx is heard saying: "Who is Miley Cyrus? The one with all the gums? She need to get a gum transplant!"
He also says: "Make a sex tape and grow up!"
A woman is heard calling Cyrus the b-word.
There's been no comment from representatives for Cyrus or the 41-year-old actor, who is the father of a teenage daughter.
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