Monica Mayhem (born Caroline Pickering;^[1] 14 March 1978) is an Australian former pornographic actress, exotic dancer^[3] and singer.

Mayhem was born in Brisbane, Queensland, Australia and she is half Australian and half Welsh.^[2] She attended Kenmore State High School but was expelled.^[1] Prior to working in porn, she worked in financial markets and futures trading in Sydney.^[2] She then moved to London and worked in an International Petroleum Exchange brokerage.^[2]

Mayhem began her career in the adult entertainment industry as a dancer at the Spearmint Rhino on Tottenham Court Road.^[2] In December 2000, Mayhem moved to the United States to begin acting in pornographic films. Her first scene was with Lee Stone in Real Sex Magazine 38.^[4] In 2002, she won the XRCO Award for Starlet of the Year^[3][5] and the FOXE Award for "Vixen of the Year".^[6]

Outside pornographic films, Mayhem was a singer/guitarist in an all-girl metal band, "Sweet Avenge".^[3]

In 2008, she appeared in a small role in the Sex and the City film, in which she is seen through a window having sex with Samantha's neighbour Dante.

Mayhem wrote an autobiography entitled Absolute Mayhem: Confessions of an Aussie Porn Star,^[3][7] which was released by Random House Australia in 2009 in her native Australia and by Skyhorse Publishing in North America the following year.^[8][9] A French translation was published in 2011 by Camion Noir.

In August 2010, she announced that she had retired from pornographic acting, after over 400 films,^[10] and that she was engaged to a Sydney veterinarian.^[11]