The 'Wide Awake' singer will be interviewed by ten of her fans from ten different countries about her upcoming music documentary, Katy Perry: Part of Me.
The interview will be streamed live on MSN, which is teaming up with Katy Perry: Part of Me's distributor Paramount Pictures for the event.
MSN UK's executive producer Pete Clifton said in a statement: "We're very excited about this event and the fact that we are bringing MSN readers the hottest stars and offering them a unique opportunity to connect with them live regardless of where they live.
"And this is just the beginning. There will be more of the biggest stars on MSN, and more amazing innovation to excite our millions of users."
Other fans can also join the interview via Twitter by asking their questions with the hashtag #msnkaty.
Katy Perry: Part of Me will hit cinemas on July 5.
Watch a clip from Katy Perry: Part of Me below: