Katy Perry is ready to blast off!

The “Firework” singer, 40, shared a behind-the-scenes video of her preparation before she and an all-women Blue Origin flight crew go into space on Monday, April 14.

In a video shared via Instagram late Sunday, April 13, Perry showed fans the inside of the New Shepard rocket that “we have been training in for the last few days.” Perry pointed out that she is in seat number two, showing off a chair with “K. Perry” written on it.

“I think I’m gonna sing, sing a little bit. I gotta sing in space!” Perry declared in the video.

“I do believe this. I’m not going to say I can’t believe here,” Perry added. “I do believe this because I think that believing your dreams and saying that is actually how you make your dreams come true.”

Perry captioned the video, “I’ve dreamt of going to space for 15 years and tomorrow that dream becomes a reality 👩🏻‍🚀🪶🐢.”

“The Taking Up Space Crew launches tomorrow morning at 7am CT and I am SO honored to be alongside 5 other incredible and inspiring women as we become the first ever all female flight space crew,” she added, tagging her fellow passengers.

Jeff Bezos’ Blue Origin announced in February that Perry and CBS Mornings host Gayle King will be among the six women to fly into space on Monday. The flight is notable for featuring the first all-women crew since Russian cosmonaut Valentina Tereshkova‘s solo spaceflight in 1963.

Perry and King will be joined by aerospace engineer Aisha Bowe, civil rights activist Amanda Nguyen, film producer Kerianne Flynn and Bezos’ fiancée, Lauren Sánchez.

Following the announcement of the mission in February, Perry took to social media to express her excitement.

“If you had told me that I would be part of the first ever all-female crew in space, I would have believed you ♥️😉,” the “California Girls” singer wrote via Instagram. “Nothing was beyond my imagination as a child. Although we didn’t grow up with much, I never stopped looking at the world with hopeful WONDER! I work hard to live my life that way still, and I am motivated more than ever to be an example for my daughter that women should take up space (pun intended).”

Perry noted that the opportunity is “so incredible” because she has the chance to “show all of the youngest and most vulnerable among us to reach for the stars, literally and figuratively.”

“I am honored to be among this diverse group of celestial sisters ✨🚀,” she added.

Monday’s takeoff is expected to take place at around 9:30 a.m. ET from Blue Origin’s Launch Site One in West Texas.