The Barbarella star went naked to pay tribute to her longtime friend in a video message which was played at Handler's 40th birthday party on 28 February (15), according to the New York Daily News.

A source tells the publication, "She received a wild message from Jane Fonda. It was Jane in a six-second video of herself, naked, on all-fours, sending Chelsea a birthday message greeting."

The tribute also featured messages from Gwyneth Paltrow and Sean Penn, while party-goers who attended the bash at Handler's home in Bel Air, California included Reese Witherspoon, Charlize Theron and Sandra Bullock.

The party raged until the early hours of the morning, and police were reportedly called to the house to investigate a noise complaint.

Handler turned 40 on 25 February (15).