She represented the University of Arkansas in the 1965 Miss Arkansas competition, which she won. After three months, she announced she was relinquishing the crown to pursue a show business career in Los Angeles.[1][2]
In Los Angeles, she was in the original cast of the Aquarius Theatre's production of Hair. She was promoted to the lead female role of Jeanie, and went on to restage the musical in Seattle, Detroit, Miami, Montreal, Copenhagen, and touring productions in Europe.[1]
Many of her fellow National Lampoon cast members went on to join Saturday Night Live. Coullet was a close friend of John Belushi, and after his death she composed and sang a tribute to him, "West Heaven," for a taped segment on SNL produced by Belushi's widow Judith Jacklin.[4]
In 1976–77, Coullet starred in the Broadway production of the musical The Robber Bridegroom, playing the role of Rosamund, and can be heard on the original Broadway album with Barry Bostwick. She also starred on Broadway in Pump Boys and Dinettes and in the off-Broadway production of Cowgirls.[1]
In 1992, she recorded an album of her own songs, titled The American Secret.[5] Several of the semiautobiographical songs from the album were incorporated into her theatrical musical production, Runaway Beauty Queen, produced at Florida Studio Theatre in 2005 and The Vineyard Playhouse in 2010.[1]
She was married to musician Armand Coullet from 1970 to 1980.[1] Her brother Scott Oglesby is a published essayist and novelist.
^Hammer, Josh (1983-02-21). "After a Year of Silent Grief, John Belushi's Widow Tells of the Troubled Man She Loved". People. This week Saturday Night Live will air a five-minute tribute to her late husband, designed and produced by Jacklin and entitled West Heaven. The tape consists of a montage of candid photos of Belushi over 15 years, accompanied by a melancholy ballad composed and sung by close friend Rhonda Coullet (backed up by several members of David Letterman's Late Night band).