Fortunately for Lily her new super-long hairdo was enough to cover her modesty when teamed with a strategically placed laptop and some Bridget Jones-like nude knickers!
"Warming up in my pants," she wrote alongside the candid snap. "Luckily @panosphair is there to document these dressing room moments," mentioning her hairstylist Panos Papandrianos who also shared the same pic on his Instagram feed.
This isn't the first flash of Lily's boobs we've seen, just last week the singer was on a one woman mission to bring under boob back in style (although we can't remember when if it was ever in?) during her performance at the City Rocks charity concert at the Royal Albert Hall on Tuesday night.
"That's inappropriate and lily allen should be ashamed of herself," one user wrote on the snap, with another saying: "'If Lily Allen is going to post pictures like that, she needs to stop using Instagram, and get a Facebook. It's obscene. Kids use Instagram, and they do not want to see that!"
However, most were supportive of Lily and are glad to see her "back on top".
MORE! Lily puts TV personality hater in check for calling her fat. Watch to find out what happened...