A six-month-old baby girl named Rosie immediately stops crying after hearing the intro of the pop star's "Blank space" a new clip uploaded on video-sharing website YouTube shows.

In the video, the baby is first seen getting really upset as she lies down on her bed. She immediately stops crying when the intro of the hit song is played. She starts crying loudly again after the music is shut off, reports aceshowbiz.com.

Swift found the video amusing and then shared it with her followers on micro-blogging website Twitter.

"THIS IS THE BEST THING I HAVE EVER SEEN (sic)," the 25-year-old superstar wrote alongside a link to the nearly-40-second clip.

Hours before tweeting the video, she posted an Instagram photograph of herself with mother-to-be Jaime King, and revealed in the caption that she'd been named Godmother to the "Hart of Dixie" star's second child.