Guiliana Rancic and Kelly Osbourne are among the many celebrities who are paying tribute to their "Fashion Police" co-host Joan Rivers, who died on Sept. 4, Thursday.

On Aug. 26, Rivers was with Rancic, Osbourne and George Kotsiopoulos on "Fashion Police" reviewing fashion at the recent 66th Primetime Emmy Awards and 2014 MTV Video Music Awards.

Two days later, the 81-year-old veteran comedian was rushed to the hospital after she stopped breathing due to cardiac arrest during a throat surgery.