She worked as a bartender, modeled swimwear and was a lingerie model.
Monaco is a former competitive gymnast, and has spent time as a dance team coach in addition to her fitness video work.
She also worked at Disney World, where she was one of the performers who portrayed "Cinderella" and "Snow White" in the resort.
Besides her Playmate appearance, she has been a part of various other Playboy related media such as the 2006 Playmates at Play swimsuit calendar and Playboy Special Edition Girls of Summer.
Monaco appeared in FHM and Men's Fitness magazines.
Her connection with Playboy began when she chosen as one of "Playboy's Sexiest Bartenders 2004" and when appeared on the cover of Playboy Special Edition Girls of Summer in August 2004.
Later, Monaco was chosen as Playmate of the Month by Playboy magazine for June 2005. In June 2006, was chosen as Playmate of the Year and later appeared in episodes of the E!
That same year, she participated in a home video fitness program, Envy, under the name "Vala" (the "V" in "Envy"),and acted together with C. reality television series The Girls Next Door which followed the lives of Playboy creator Hugh Hefner and his girlfriends.
In 2006, she also appeared in the game show Identity and the television film Sideliners.Monaco also appeared in the 2006 "Playmates at Play" swimsuit calendar.In 2007, Monaco appeared in three episodes of Up Close with Carrie Keagan, an episode of Model Dating: Hawaii and on an episode of Jimmy Kimmel Live! Branching off from reality television, Monaco portrayed Michelle in two episodes of the soap opera Passions.Monaco continued to make guest appearances in The Girls Next Door throughout 20.In 2008, she again appeared in three episodes of another reality show, Mind of a Model.On July 4, 2012 Monaco was revealed to be one of 12 new houseguests participating in the fourteenth edition of the reality competition series Big Brother.