The image David Hill (@davehill77) says portrays Brooke Shields smoking pot. (Twitter)

A representative for Brooke Shields has dismissed reports suggesting the model-turned-actress has been pictured appearing to smoke a marijuana pipe after an old photo surfaced online.

Twitter user @davehill77 posted the 1980s snap on the internet on Thursday, alongside the caption: "Here is a photo of Brooke Shields smoking pot with H.R."

The photo features a young woman, who bears a striking similarity to the former child star, lighting a small smoking device as she sits beside Bad Brains punk rocker H.R.

However, Shields' spokesperson has moved swiftly to put a stop to the identity claims, insisting the lady pictured is not the actress, reports the New York Daily News.

The 47-year-old famously filmed an anti-smoking public service announcement as a teen, in which she declared, "I think smoking is for real losers."