Lilly Allen has taken to Twitter to clarify a joke she made about Lady Gaga's gender.

The 25-year-old singer was on stage at the Big Chill festival in the UK when a concert-goer threw a potato onto the stage.

The tater was wrapped in a message, which she read to the crowd, The Express reports.

"It says, 'Show me your penis'. They must have mistaken me for Lady Gaga," Allen quipped, referring to rumours that the Bad Romance singer is a hermaphrodite.

Allen took to Twitter to clear up her comments, posting, "Everyone knows I am ladygagas biggest fan. So don't believe the bullshit.

I'm a little monster and NO ONE can take that away from me!"