The 25-year-old "Shake It Off" hitmaker paid a touching tribute to four-week-old Leo Thames during her concert at Santa Carla's Levi's Stadium in California on August 15, as she dedicated a song to the little boy, reported Contactmusic.
Speaking before performing "Never Grow Up", she told the crowd, "I wrote it when I was like 18 or 19 but my friend just had a baby and she made me godmother of it and I was holding this little baby the other night and I was just thinking differently.
Footage of the touching dedication quickly spread online, with King among those who watched the footage.
The delighted "Sin City" actress then took to Twitter to share how "blessed" she is to have Swift play an important role in her son's life.
"This is so beautiful Tay, Leo Thames is so blessed (sic)," King wrote.