Bubble Pop! is the debut EP by Hyuna, a member of South Korean girl group 4Minute. It was released on July 5, 2011 under Cube Entertainment and reached number 7 on Korea's Gaon Weekly Albums Chart.

On June 30, 2011, a promotional single, "A Bitter Day", was released digitally. It featured guest singer G.NA in the chorus and rapping by Yong Jun-hyung of Beast. It was co-written by Yong and Choi Kyu-sung. The song peaked at number 10 on the Gaon Weekly Digital Chart and at number 165 on the Gaon Year-End Digital Chart for 2011.

On July 5, 2011, the EP's title track, "Bubble Pop!", and its music video were released. The music video features a cameo by MBLAQ's Lee Joon. The Music Video was filmed on Okinawa, Japan Hyuna promoted the song on music shows from July 8, 2011 on KBS's Music Bank, MBC's Show! Music Core, SBS's Inkigayo and Mnet's M! Countdown. The song reached number 4 on the Gaon Weekly Digital Chart and finished 2011 at number 21 on Gaon's year-end chart. It has sold a total of 2,694,310 digital copies.

In December 9, 2011, title track "Bubble Pop!" ranked #9 on American music magazine SPIN's "20 Best Songs of 2011" list.

The song was parodied in the 2016 Family Guy episode "Candy, Quahog Marshmallow!".

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