Las Vegas: Kathy Griffin Becomes Britney’s “Pet” In Concert

Kathy Griffin guests in Britney’s “Freakshow” 

This past weekend, Kathy Griffin was Britney Spears’ special guest during the number “Freakshow” at Britney’s PIECE OF ME at Planet Hollywood.

Looks like Kathy was more than willing to wear the collar and leash.

Although, doesn’t Britney look like she’s walking through the number? Such a shame since her dancers are fantastic and kill themselves putting on a show…

The famous twosome traded tweets later…