Credit: Jeff Kravitz/FilmMagic

Crocodile tears?

Chris Brown caused a lot of chatter at the BET Awards Sunday when he broke down in tears during a Michael Jackson tribute.

An insider tells the crying was fake.

Before he took the stage to belt out "Man in the Mirror," a backstage source tells Us one of Brown's bodyguards gave the singer, 21, tear-inducing eye drops.

Brown's rep denies it, telling Us that this account is "completely untrue." But the witness says Brown definitely used drops. See the top 10 shameless male crying displays.

Says the source, "He rubbed it in and he started crying."

Tell Us: Do you think Chris Brown's tears were real?